599 lines
16 KiB
C
Executable file
599 lines
16 KiB
C
Executable file
/*
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* Early boot support code for BootX bootloader
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*
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* Copyright (C) 2005 Ben. Herrenschmidt (benh@kernel.crashing.org)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <generated/utsrelease.h>
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#include <asm/sections.h>
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#include <asm/prom.h>
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#include <asm/page.h>
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#include <asm/bootx.h>
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#include <asm/btext.h>
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#include <asm/io.h>
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#include <asm/setup.h>
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#undef DEBUG
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#define SET_BOOT_BAT
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#ifdef DEBUG
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#define DBG(fmt...) do { bootx_printf(fmt); } while(0)
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#else
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#define DBG(fmt...) do { } while(0)
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#endif
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extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
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static unsigned long __initdata bootx_dt_strbase;
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static unsigned long __initdata bootx_dt_strend;
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static unsigned long __initdata bootx_node_chosen;
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static boot_infos_t * __initdata bootx_info;
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static char __initdata bootx_disp_path[256];
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/* Is boot-info compatible ? */
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#define BOOT_INFO_IS_COMPATIBLE(bi) \
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((bi)->compatible_version <= BOOT_INFO_VERSION)
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#define BOOT_INFO_IS_V2_COMPATIBLE(bi) ((bi)->version >= 2)
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#define BOOT_INFO_IS_V4_COMPATIBLE(bi) ((bi)->version >= 4)
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#ifdef CONFIG_BOOTX_TEXT
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static void __init bootx_printf(const char *format, ...)
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{
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const char *p, *q, *s;
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va_list args;
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unsigned long v;
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va_start(args, format);
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for (p = format; *p != 0; p = q) {
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for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
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;
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if (q > p)
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btext_drawtext(p, q - p);
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if (*q == 0)
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break;
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if (*q == '\n') {
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++q;
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btext_flushline();
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btext_drawstring("\r\n");
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btext_flushline();
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continue;
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}
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++q;
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if (*q == 0)
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break;
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switch (*q) {
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case 's':
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++q;
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s = va_arg(args, const char *);
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if (s == NULL)
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s = "<NULL>";
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btext_drawstring(s);
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break;
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case 'x':
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++q;
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v = va_arg(args, unsigned long);
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btext_drawhex(v);
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break;
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}
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}
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va_end(args);
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}
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#else /* CONFIG_BOOTX_TEXT */
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static void __init bootx_printf(const char *format, ...) {}
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#endif /* CONFIG_BOOTX_TEXT */
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static void * __init bootx_early_getprop(unsigned long base,
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unsigned long node,
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char *prop)
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{
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struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
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u32 *ppp = &np->properties;
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while(*ppp) {
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struct bootx_dt_prop *pp =
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(struct bootx_dt_prop *)(base + *ppp);
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if (strcmp((char *)((unsigned long)pp->name + base),
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prop) == 0) {
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return (void *)((unsigned long)pp->value + base);
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}
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ppp = &pp->next;
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}
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return NULL;
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}
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#define dt_push_token(token, mem) \
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do { \
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*(mem) = _ALIGN_UP(*(mem),4); \
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*((u32 *)*(mem)) = token; \
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*(mem) += 4; \
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} while(0)
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static unsigned long __init bootx_dt_find_string(char *str)
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{
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char *s, *os;
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s = os = (char *)bootx_dt_strbase;
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s += 4;
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while (s < (char *)bootx_dt_strend) {
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if (strcmp(s, str) == 0)
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return s - os;
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s += strlen(s) + 1;
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}
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return 0;
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}
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static void __init bootx_dt_add_prop(char *name, void *data, int size,
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unsigned long *mem_end)
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{
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unsigned long soff = bootx_dt_find_string(name);
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if (data == NULL)
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size = 0;
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if (soff == 0) {
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bootx_printf("WARNING: Can't find string index for <%s>\n",
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name);
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return;
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}
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if (size > 0x20000) {
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bootx_printf("WARNING: ignoring large property ");
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bootx_printf("%s length 0x%x\n", name, size);
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return;
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}
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dt_push_token(OF_DT_PROP, mem_end);
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dt_push_token(size, mem_end);
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dt_push_token(soff, mem_end);
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/* push property content */
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if (size && data) {
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memcpy((void *)*mem_end, data, size);
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*mem_end = _ALIGN_UP(*mem_end + size, 4);
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}
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}
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static void __init bootx_add_chosen_props(unsigned long base,
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unsigned long *mem_end)
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{
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u32 val;
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bootx_dt_add_prop("linux,bootx", NULL, 0, mem_end);
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if (bootx_info->kernelParamsOffset) {
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char *args = (char *)((unsigned long)bootx_info) +
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bootx_info->kernelParamsOffset;
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bootx_dt_add_prop("bootargs", args, strlen(args) + 1, mem_end);
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}
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if (bootx_info->ramDisk) {
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val = ((unsigned long)bootx_info) + bootx_info->ramDisk;
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bootx_dt_add_prop("linux,initrd-start", &val, 4, mem_end);
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val += bootx_info->ramDiskSize;
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bootx_dt_add_prop("linux,initrd-end", &val, 4, mem_end);
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}
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if (strlen(bootx_disp_path))
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bootx_dt_add_prop("linux,stdout-path", bootx_disp_path,
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strlen(bootx_disp_path) + 1, mem_end);
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}
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static void __init bootx_add_display_props(unsigned long base,
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unsigned long *mem_end,
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int has_real_node)
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{
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boot_infos_t *bi = bootx_info;
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u32 tmp;
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if (has_real_node) {
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bootx_dt_add_prop("linux,boot-display", NULL, 0, mem_end);
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bootx_dt_add_prop("linux,opened", NULL, 0, mem_end);
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} else
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bootx_dt_add_prop("linux,bootx-noscreen", NULL, 0, mem_end);
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tmp = bi->dispDeviceDepth;
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bootx_dt_add_prop("linux,bootx-depth", &tmp, 4, mem_end);
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tmp = bi->dispDeviceRect[2] - bi->dispDeviceRect[0];
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bootx_dt_add_prop("linux,bootx-width", &tmp, 4, mem_end);
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tmp = bi->dispDeviceRect[3] - bi->dispDeviceRect[1];
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bootx_dt_add_prop("linux,bootx-height", &tmp, 4, mem_end);
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tmp = bi->dispDeviceRowBytes;
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bootx_dt_add_prop("linux,bootx-linebytes", &tmp, 4, mem_end);
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tmp = (u32)bi->dispDeviceBase;
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if (tmp == 0)
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tmp = (u32)bi->logicalDisplayBase;
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tmp += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
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tmp += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
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bootx_dt_add_prop("linux,bootx-addr", &tmp, 4, mem_end);
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}
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static void __init bootx_dt_add_string(char *s, unsigned long *mem_end)
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{
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unsigned int l = strlen(s) + 1;
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memcpy((void *)*mem_end, s, l);
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bootx_dt_strend = *mem_end = *mem_end + l;
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}
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static void __init bootx_scan_dt_build_strings(unsigned long base,
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unsigned long node,
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unsigned long *mem_end)
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{
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struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
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u32 *cpp, *ppp = &np->properties;
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unsigned long soff;
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char *namep;
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/* Keep refs to known nodes */
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namep = np->full_name ? (char *)(base + np->full_name) : NULL;
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if (namep == NULL) {
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bootx_printf("Node without a full name !\n");
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namep = "";
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}
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DBG("* strings: %s\n", namep);
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if (!strcmp(namep, "/chosen")) {
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DBG(" detected /chosen ! adding properties names !\n");
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bootx_dt_add_string("linux,bootx", mem_end);
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bootx_dt_add_string("linux,stdout-path", mem_end);
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bootx_dt_add_string("linux,initrd-start", mem_end);
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bootx_dt_add_string("linux,initrd-end", mem_end);
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bootx_dt_add_string("bootargs", mem_end);
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bootx_node_chosen = node;
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}
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if (node == bootx_info->dispDeviceRegEntryOffset) {
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DBG(" detected display ! adding properties names !\n");
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bootx_dt_add_string("linux,boot-display", mem_end);
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bootx_dt_add_string("linux,opened", mem_end);
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strlcpy(bootx_disp_path, namep, sizeof(bootx_disp_path));
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}
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/* get and store all property names */
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while (*ppp) {
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struct bootx_dt_prop *pp =
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(struct bootx_dt_prop *)(base + *ppp);
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namep = pp->name ? (char *)(base + pp->name) : NULL;
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if (namep == NULL || strcmp(namep, "name") == 0)
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goto next;
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/* get/create string entry */
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soff = bootx_dt_find_string(namep);
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if (soff == 0)
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bootx_dt_add_string(namep, mem_end);
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next:
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ppp = &pp->next;
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}
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/* do all our children */
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cpp = &np->child;
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while(*cpp) {
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np = (struct bootx_dt_node *)(base + *cpp);
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bootx_scan_dt_build_strings(base, *cpp, mem_end);
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cpp = &np->sibling;
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}
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}
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static void __init bootx_scan_dt_build_struct(unsigned long base,
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unsigned long node,
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unsigned long *mem_end)
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{
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struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
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u32 *cpp, *ppp = &np->properties;
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char *namep, *p, *ep, *lp;
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int l;
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dt_push_token(OF_DT_BEGIN_NODE, mem_end);
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/* get the node's full name */
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namep = np->full_name ? (char *)(base + np->full_name) : NULL;
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if (namep == NULL)
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namep = "";
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l = strlen(namep);
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DBG("* struct: %s\n", namep);
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/* Fixup an Apple bug where they have bogus \0 chars in the
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* middle of the path in some properties, and extract
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* the unit name (everything after the last '/').
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*/
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memcpy((void *)*mem_end, namep, l + 1);
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namep = (char *)*mem_end;
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for (lp = p = namep, ep = namep + l; p < ep; p++) {
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if (*p == '/')
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lp = namep;
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else if (*p != 0)
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*lp++ = *p;
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}
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*lp = 0;
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*mem_end = _ALIGN_UP((unsigned long)lp + 1, 4);
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/* get and store all properties */
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while (*ppp) {
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struct bootx_dt_prop *pp =
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(struct bootx_dt_prop *)(base + *ppp);
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namep = pp->name ? (char *)(base + pp->name) : NULL;
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/* Skip "name" */
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if (namep == NULL || !strcmp(namep, "name"))
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goto next;
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/* Skip "bootargs" in /chosen too as we replace it */
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if (node == bootx_node_chosen && !strcmp(namep, "bootargs"))
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goto next;
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/* push property head */
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bootx_dt_add_prop(namep,
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pp->value ? (void *)(base + pp->value): NULL,
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pp->length, mem_end);
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next:
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ppp = &pp->next;
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}
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if (node == bootx_node_chosen) {
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bootx_add_chosen_props(base, mem_end);
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if (bootx_info->dispDeviceRegEntryOffset == 0)
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bootx_add_display_props(base, mem_end, 0);
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}
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else if (node == bootx_info->dispDeviceRegEntryOffset)
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bootx_add_display_props(base, mem_end, 1);
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/* do all our children */
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cpp = &np->child;
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while(*cpp) {
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np = (struct bootx_dt_node *)(base + *cpp);
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bootx_scan_dt_build_struct(base, *cpp, mem_end);
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cpp = &np->sibling;
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}
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dt_push_token(OF_DT_END_NODE, mem_end);
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}
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static unsigned long __init bootx_flatten_dt(unsigned long start)
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{
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boot_infos_t *bi = bootx_info;
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unsigned long mem_start, mem_end;
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struct boot_param_header *hdr;
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unsigned long base;
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u64 *rsvmap;
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/* Start using memory after the big blob passed by BootX, get
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* some space for the header
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*/
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mem_start = mem_end = _ALIGN_UP(((unsigned long)bi) + start, 4);
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DBG("Boot params header at: %x\n", mem_start);
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hdr = (struct boot_param_header *)mem_start;
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mem_end += sizeof(struct boot_param_header);
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rsvmap = (u64 *)(_ALIGN_UP(mem_end, 8));
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hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - mem_start;
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mem_end = ((unsigned long)rsvmap) + 8 * sizeof(u64);
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/* Get base of tree */
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base = ((unsigned long)bi) + bi->deviceTreeOffset;
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/* Build string array */
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DBG("Building string array at: %x\n", mem_end);
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DBG("Device Tree Base=%x\n", base);
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bootx_dt_strbase = mem_end;
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mem_end += 4;
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bootx_dt_strend = mem_end;
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bootx_scan_dt_build_strings(base, 4, &mem_end);
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/* Add some strings */
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bootx_dt_add_string("linux,bootx-noscreen", &mem_end);
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bootx_dt_add_string("linux,bootx-depth", &mem_end);
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bootx_dt_add_string("linux,bootx-width", &mem_end);
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bootx_dt_add_string("linux,bootx-height", &mem_end);
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bootx_dt_add_string("linux,bootx-linebytes", &mem_end);
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bootx_dt_add_string("linux,bootx-addr", &mem_end);
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/* Wrap up strings */
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hdr->off_dt_strings = bootx_dt_strbase - mem_start;
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hdr->dt_strings_size = bootx_dt_strend - bootx_dt_strbase;
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/* Build structure */
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mem_end = _ALIGN(mem_end, 16);
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DBG("Building device tree structure at: %x\n", mem_end);
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hdr->off_dt_struct = mem_end - mem_start;
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bootx_scan_dt_build_struct(base, 4, &mem_end);
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dt_push_token(OF_DT_END, &mem_end);
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/* Finish header */
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hdr->boot_cpuid_phys = 0;
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hdr->magic = OF_DT_HEADER;
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hdr->totalsize = mem_end - mem_start;
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hdr->version = OF_DT_VERSION;
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/* Version 16 is not backward compatible */
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hdr->last_comp_version = 0x10;
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/* Reserve the whole thing and copy the reserve map in, we
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* also bump mem_reserve_cnt to cause further reservations to
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* fail since it's too late.
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*/
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mem_end = _ALIGN(mem_end, PAGE_SIZE);
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DBG("End of boot params: %x\n", mem_end);
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rsvmap[0] = mem_start;
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rsvmap[1] = mem_end;
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if (bootx_info->ramDisk) {
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rsvmap[2] = ((unsigned long)bootx_info) + bootx_info->ramDisk;
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rsvmap[3] = rsvmap[2] + bootx_info->ramDiskSize;
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rsvmap[4] = 0;
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rsvmap[5] = 0;
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} else {
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rsvmap[2] = 0;
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rsvmap[3] = 0;
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}
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return (unsigned long)hdr;
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}
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#ifdef CONFIG_BOOTX_TEXT
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static void __init btext_welcome(boot_infos_t *bi)
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{
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unsigned long flags;
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unsigned long pvr;
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bootx_printf("Welcome to Linux, kernel " UTS_RELEASE "\n");
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bootx_printf("\nlinked at : 0x%x", KERNELBASE);
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bootx_printf("\nframe buffer at : 0x%x", bi->dispDeviceBase);
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bootx_printf(" (phys), 0x%x", bi->logicalDisplayBase);
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bootx_printf(" (log)");
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bootx_printf("\nklimit : 0x%x",(unsigned long)klimit);
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bootx_printf("\nboot_info at : 0x%x", bi);
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__asm__ __volatile__ ("mfmsr %0" : "=r" (flags));
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bootx_printf("\nMSR : 0x%x", flags);
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__asm__ __volatile__ ("mfspr %0, 287" : "=r" (pvr));
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bootx_printf("\nPVR : 0x%x", pvr);
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pvr >>= 16;
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if (pvr > 1) {
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__asm__ __volatile__ ("mfspr %0, 1008" : "=r" (flags));
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bootx_printf("\nHID0 : 0x%x", flags);
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}
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if (pvr == 8 || pvr == 12 || pvr == 0x800c) {
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__asm__ __volatile__ ("mfspr %0, 1019" : "=r" (flags));
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bootx_printf("\nICTC : 0x%x", flags);
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}
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#ifdef DEBUG
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bootx_printf("\n\n");
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bootx_printf("bi->deviceTreeOffset : 0x%x\n",
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bi->deviceTreeOffset);
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bootx_printf("bi->deviceTreeSize : 0x%x\n",
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bi->deviceTreeSize);
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#endif
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bootx_printf("\n\n");
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}
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#endif /* CONFIG_BOOTX_TEXT */
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void __init bootx_init(unsigned long r3, unsigned long r4)
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{
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boot_infos_t *bi = (boot_infos_t *) r4;
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unsigned long hdr;
|
|
unsigned long space;
|
|
unsigned long ptr;
|
|
char *model;
|
|
unsigned long offset = reloc_offset();
|
|
|
|
reloc_got2(offset);
|
|
|
|
bootx_info = bi;
|
|
|
|
/* We haven't cleared any bss at this point, make sure
|
|
* what we need is initialized
|
|
*/
|
|
bootx_dt_strbase = bootx_dt_strend = 0;
|
|
bootx_node_chosen = 0;
|
|
bootx_disp_path[0] = 0;
|
|
|
|
if (!BOOT_INFO_IS_V2_COMPATIBLE(bi))
|
|
bi->logicalDisplayBase = bi->dispDeviceBase;
|
|
|
|
/* Fixup depth 16 -> 15 as that's what MacOS calls 16bpp */
|
|
if (bi->dispDeviceDepth == 16)
|
|
bi->dispDeviceDepth = 15;
|
|
|
|
|
|
#ifdef CONFIG_BOOTX_TEXT
|
|
ptr = (unsigned long)bi->logicalDisplayBase;
|
|
ptr += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
|
|
ptr += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
|
|
btext_setup_display(bi->dispDeviceRect[2] - bi->dispDeviceRect[0],
|
|
bi->dispDeviceRect[3] - bi->dispDeviceRect[1],
|
|
bi->dispDeviceDepth, bi->dispDeviceRowBytes,
|
|
(unsigned long)bi->logicalDisplayBase);
|
|
btext_clearscreen();
|
|
btext_flushscreen();
|
|
#endif /* CONFIG_BOOTX_TEXT */
|
|
|
|
/*
|
|
* Test if boot-info is compatible. Done only in config
|
|
* CONFIG_BOOTX_TEXT since there is nothing much we can do
|
|
* with an incompatible version, except display a message
|
|
* and eventually hang the processor...
|
|
*
|
|
* I'll try to keep enough of boot-info compatible in the
|
|
* future to always allow display of this message;
|
|
*/
|
|
if (!BOOT_INFO_IS_COMPATIBLE(bi)) {
|
|
bootx_printf(" !!! WARNING - Incompatible version"
|
|
" of BootX !!!\n\n\n");
|
|
for (;;)
|
|
;
|
|
}
|
|
if (bi->architecture != BOOT_ARCH_PCI) {
|
|
bootx_printf(" !!! WARNING - Unsupported machine"
|
|
" architecture !\n");
|
|
for (;;)
|
|
;
|
|
}
|
|
|
|
#ifdef CONFIG_BOOTX_TEXT
|
|
btext_welcome(bi);
|
|
#endif
|
|
|
|
/* New BootX enters kernel with MMU off, i/os are not allowed
|
|
* here. This hack will have been done by the boostrap anyway.
|
|
*/
|
|
if (bi->version < 4) {
|
|
/*
|
|
* XXX If this is an iMac, turn off the USB controller.
|
|
*/
|
|
model = (char *) bootx_early_getprop(r4 + bi->deviceTreeOffset,
|
|
4, "model");
|
|
if (model
|
|
&& (strcmp(model, "iMac,1") == 0
|
|
|| strcmp(model, "PowerMac1,1") == 0)) {
|
|
bootx_printf("iMac,1 detected, shutting down USB\n");
|
|
out_le32((unsigned __iomem *)0x80880008, 1); /* XXX */
|
|
}
|
|
}
|
|
|
|
/* Get a pointer that points above the device tree, args, ramdisk,
|
|
* etc... to use for generating the flattened tree
|
|
*/
|
|
if (bi->version < 5) {
|
|
space = bi->deviceTreeOffset + bi->deviceTreeSize;
|
|
if (bi->ramDisk >= space)
|
|
space = bi->ramDisk + bi->ramDiskSize;
|
|
} else
|
|
space = bi->totalParamsSize;
|
|
|
|
bootx_printf("Total space used by parameters & ramdisk: 0x%x\n", space);
|
|
|
|
/* New BootX will have flushed all TLBs and enters kernel with
|
|
* MMU switched OFF, so this should not be useful anymore.
|
|
*/
|
|
if (bi->version < 4) {
|
|
unsigned long x __maybe_unused;
|
|
|
|
bootx_printf("Touching pages...\n");
|
|
|
|
/*
|
|
* Touch each page to make sure the PTEs for them
|
|
* are in the hash table - the aim is to try to avoid
|
|
* getting DSI exceptions while copying the kernel image.
|
|
*/
|
|
for (ptr = ((unsigned long) &_stext) & PAGE_MASK;
|
|
ptr < (unsigned long)bi + space; ptr += PAGE_SIZE)
|
|
x = *(volatile unsigned long *)ptr;
|
|
}
|
|
|
|
/* Ok, now we need to generate a flattened device-tree to pass
|
|
* to the kernel
|
|
*/
|
|
bootx_printf("Preparing boot params...\n");
|
|
|
|
hdr = bootx_flatten_dt(space);
|
|
|
|
#ifdef CONFIG_BOOTX_TEXT
|
|
#ifdef SET_BOOT_BAT
|
|
bootx_printf("Preparing BAT...\n");
|
|
btext_prepare_BAT();
|
|
#else
|
|
btext_unmap();
|
|
#endif
|
|
#endif
|
|
|
|
reloc_got2(-offset);
|
|
|
|
__start(hdr, KERNELBASE + offset, 0);
|
|
}
|