350 lines
8.1 KiB
C
350 lines
8.1 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* r2300.c: R2000 and R3000 specific mmu/cache code.
|
||
|
|
*
|
||
|
|
* Copyright (C) 1996 David S. Miller (davem@davemloft.net)
|
||
|
|
*
|
||
|
|
* with a lot of changes to make this thing work for R3000s
|
||
|
|
* Tx39XX R4k style caches added. HK
|
||
|
|
* Copyright (C) 1998, 1999, 2000 Harald Koerfgen
|
||
|
|
* Copyright (C) 1998 Gleb Raiko & Vladimir Roganov
|
||
|
|
* Copyright (C) 2001, 2004, 2007 Maciej W. Rozycki
|
||
|
|
*/
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <linux/smp.h>
|
||
|
|
#include <linux/mm.h>
|
||
|
|
|
||
|
|
#include <asm/page.h>
|
||
|
|
#include <asm/pgtable.h>
|
||
|
|
#include <asm/mmu_context.h>
|
||
|
|
#include <asm/isadep.h>
|
||
|
|
#include <asm/io.h>
|
||
|
|
#include <asm/bootinfo.h>
|
||
|
|
#include <asm/cpu.h>
|
||
|
|
|
||
|
|
static unsigned long icache_size, dcache_size; /* Size in bytes */
|
||
|
|
static unsigned long icache_lsize, dcache_lsize; /* Size in bytes */
|
||
|
|
|
||
|
|
unsigned long r3k_cache_size(unsigned long ca_flags)
|
||
|
|
{
|
||
|
|
unsigned long flags, status, dummy, size;
|
||
|
|
volatile unsigned long *p;
|
||
|
|
|
||
|
|
p = (volatile unsigned long *) KSEG0;
|
||
|
|
|
||
|
|
flags = read_c0_status();
|
||
|
|
|
||
|
|
/* isolate cache space */
|
||
|
|
write_c0_status((ca_flags|flags)&~ST0_IEC);
|
||
|
|
|
||
|
|
*p = 0xa5a55a5a;
|
||
|
|
dummy = *p;
|
||
|
|
status = read_c0_status();
|
||
|
|
|
||
|
|
if (dummy != 0xa5a55a5a || (status & ST0_CM)) {
|
||
|
|
size = 0;
|
||
|
|
} else {
|
||
|
|
for (size = 128; size <= 0x40000; size <<= 1)
|
||
|
|
*(p + size) = 0;
|
||
|
|
*p = -1;
|
||
|
|
for (size = 128;
|
||
|
|
(size <= 0x40000) && (*(p + size) == 0);
|
||
|
|
size <<= 1)
|
||
|
|
;
|
||
|
|
if (size > 0x40000)
|
||
|
|
size = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
write_c0_status(flags);
|
||
|
|
|
||
|
|
return size * sizeof(*p);
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned long r3k_cache_lsize(unsigned long ca_flags)
|
||
|
|
{
|
||
|
|
unsigned long flags, status, lsize, i;
|
||
|
|
volatile unsigned long *p;
|
||
|
|
|
||
|
|
p = (volatile unsigned long *) KSEG0;
|
||
|
|
|
||
|
|
flags = read_c0_status();
|
||
|
|
|
||
|
|
/* isolate cache space */
|
||
|
|
write_c0_status((ca_flags|flags)&~ST0_IEC);
|
||
|
|
|
||
|
|
for (i = 0; i < 128; i++)
|
||
|
|
*(p + i) = 0;
|
||
|
|
*(volatile unsigned char *)p = 0;
|
||
|
|
for (lsize = 1; lsize < 128; lsize <<= 1) {
|
||
|
|
*(p + lsize);
|
||
|
|
status = read_c0_status();
|
||
|
|
if (!(status & ST0_CM))
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
for (i = 0; i < 128; i += lsize)
|
||
|
|
*(volatile unsigned char *)(p + i) = 0;
|
||
|
|
|
||
|
|
write_c0_status(flags);
|
||
|
|
|
||
|
|
return lsize * sizeof(*p);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void r3k_probe_cache(void)
|
||
|
|
{
|
||
|
|
dcache_size = r3k_cache_size(ST0_ISC);
|
||
|
|
if (dcache_size)
|
||
|
|
dcache_lsize = r3k_cache_lsize(ST0_ISC);
|
||
|
|
|
||
|
|
icache_size = r3k_cache_size(ST0_ISC|ST0_SWC);
|
||
|
|
if (icache_size)
|
||
|
|
icache_lsize = r3k_cache_lsize(ST0_ISC|ST0_SWC);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void r3k_flush_icache_range(unsigned long start, unsigned long end)
|
||
|
|
{
|
||
|
|
unsigned long size, i, flags;
|
||
|
|
volatile unsigned char *p;
|
||
|
|
|
||
|
|
size = end - start;
|
||
|
|
if (size > icache_size || KSEGX(start) != KSEG0) {
|
||
|
|
start = KSEG0;
|
||
|
|
size = icache_size;
|
||
|
|
}
|
||
|
|
p = (char *)start;
|
||
|
|
|
||
|
|
flags = read_c0_status();
|
||
|
|
|
||
|
|
/* isolate cache space */
|
||
|
|
write_c0_status((ST0_ISC|ST0_SWC|flags)&~ST0_IEC);
|
||
|
|
|
||
|
|
for (i = 0; i < size; i += 0x080) {
|
||
|
|
asm( "sb\t$0, 0x000(%0)\n\t"
|
||
|
|
"sb\t$0, 0x004(%0)\n\t"
|
||
|
|
"sb\t$0, 0x008(%0)\n\t"
|
||
|
|
"sb\t$0, 0x00c(%0)\n\t"
|
||
|
|
"sb\t$0, 0x010(%0)\n\t"
|
||
|
|
"sb\t$0, 0x014(%0)\n\t"
|
||
|
|
"sb\t$0, 0x018(%0)\n\t"
|
||
|
|
"sb\t$0, 0x01c(%0)\n\t"
|
||
|
|
"sb\t$0, 0x020(%0)\n\t"
|
||
|
|
"sb\t$0, 0x024(%0)\n\t"
|
||
|
|
"sb\t$0, 0x028(%0)\n\t"
|
||
|
|
"sb\t$0, 0x02c(%0)\n\t"
|
||
|
|
"sb\t$0, 0x030(%0)\n\t"
|
||
|
|
"sb\t$0, 0x034(%0)\n\t"
|
||
|
|
"sb\t$0, 0x038(%0)\n\t"
|
||
|
|
"sb\t$0, 0x03c(%0)\n\t"
|
||
|
|
"sb\t$0, 0x040(%0)\n\t"
|
||
|
|
"sb\t$0, 0x044(%0)\n\t"
|
||
|
|
"sb\t$0, 0x048(%0)\n\t"
|
||
|
|
"sb\t$0, 0x04c(%0)\n\t"
|
||
|
|
"sb\t$0, 0x050(%0)\n\t"
|
||
|
|
"sb\t$0, 0x054(%0)\n\t"
|
||
|
|
"sb\t$0, 0x058(%0)\n\t"
|
||
|
|
"sb\t$0, 0x05c(%0)\n\t"
|
||
|
|
"sb\t$0, 0x060(%0)\n\t"
|
||
|
|
"sb\t$0, 0x064(%0)\n\t"
|
||
|
|
"sb\t$0, 0x068(%0)\n\t"
|
||
|
|
"sb\t$0, 0x06c(%0)\n\t"
|
||
|
|
"sb\t$0, 0x070(%0)\n\t"
|
||
|
|
"sb\t$0, 0x074(%0)\n\t"
|
||
|
|
"sb\t$0, 0x078(%0)\n\t"
|
||
|
|
"sb\t$0, 0x07c(%0)\n\t"
|
||
|
|
: : "r" (p) );
|
||
|
|
p += 0x080;
|
||
|
|
}
|
||
|
|
|
||
|
|
write_c0_status(flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void r3k_flush_dcache_range(unsigned long start, unsigned long end)
|
||
|
|
{
|
||
|
|
unsigned long size, i, flags;
|
||
|
|
volatile unsigned char *p;
|
||
|
|
|
||
|
|
size = end - start;
|
||
|
|
if (size > dcache_size || KSEGX(start) != KSEG0) {
|
||
|
|
start = KSEG0;
|
||
|
|
size = dcache_size;
|
||
|
|
}
|
||
|
|
p = (char *)start;
|
||
|
|
|
||
|
|
flags = read_c0_status();
|
||
|
|
|
||
|
|
/* isolate cache space */
|
||
|
|
write_c0_status((ST0_ISC|flags)&~ST0_IEC);
|
||
|
|
|
||
|
|
for (i = 0; i < size; i += 0x080) {
|
||
|
|
asm( "sb\t$0, 0x000(%0)\n\t"
|
||
|
|
"sb\t$0, 0x004(%0)\n\t"
|
||
|
|
"sb\t$0, 0x008(%0)\n\t"
|
||
|
|
"sb\t$0, 0x00c(%0)\n\t"
|
||
|
|
"sb\t$0, 0x010(%0)\n\t"
|
||
|
|
"sb\t$0, 0x014(%0)\n\t"
|
||
|
|
"sb\t$0, 0x018(%0)\n\t"
|
||
|
|
"sb\t$0, 0x01c(%0)\n\t"
|
||
|
|
"sb\t$0, 0x020(%0)\n\t"
|
||
|
|
"sb\t$0, 0x024(%0)\n\t"
|
||
|
|
"sb\t$0, 0x028(%0)\n\t"
|
||
|
|
"sb\t$0, 0x02c(%0)\n\t"
|
||
|
|
"sb\t$0, 0x030(%0)\n\t"
|
||
|
|
"sb\t$0, 0x034(%0)\n\t"
|
||
|
|
"sb\t$0, 0x038(%0)\n\t"
|
||
|
|
"sb\t$0, 0x03c(%0)\n\t"
|
||
|
|
"sb\t$0, 0x040(%0)\n\t"
|
||
|
|
"sb\t$0, 0x044(%0)\n\t"
|
||
|
|
"sb\t$0, 0x048(%0)\n\t"
|
||
|
|
"sb\t$0, 0x04c(%0)\n\t"
|
||
|
|
"sb\t$0, 0x050(%0)\n\t"
|
||
|
|
"sb\t$0, 0x054(%0)\n\t"
|
||
|
|
"sb\t$0, 0x058(%0)\n\t"
|
||
|
|
"sb\t$0, 0x05c(%0)\n\t"
|
||
|
|
"sb\t$0, 0x060(%0)\n\t"
|
||
|
|
"sb\t$0, 0x064(%0)\n\t"
|
||
|
|
"sb\t$0, 0x068(%0)\n\t"
|
||
|
|
"sb\t$0, 0x06c(%0)\n\t"
|
||
|
|
"sb\t$0, 0x070(%0)\n\t"
|
||
|
|
"sb\t$0, 0x074(%0)\n\t"
|
||
|
|
"sb\t$0, 0x078(%0)\n\t"
|
||
|
|
"sb\t$0, 0x07c(%0)\n\t"
|
||
|
|
: : "r" (p) );
|
||
|
|
p += 0x080;
|
||
|
|
}
|
||
|
|
|
||
|
|
write_c0_status(flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void r3k_flush_cache_all(void)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void r3k___flush_cache_all(void)
|
||
|
|
{
|
||
|
|
r3k_flush_dcache_range(KSEG0, KSEG0 + dcache_size);
|
||
|
|
r3k_flush_icache_range(KSEG0, KSEG0 + icache_size);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void r3k_flush_cache_mm(struct mm_struct *mm)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
static void r3k_flush_cache_range(struct vm_area_struct *vma,
|
||
|
|
unsigned long start, unsigned long end)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
static void r3k_flush_cache_page(struct vm_area_struct *vma,
|
||
|
|
unsigned long addr, unsigned long pfn)
|
||
|
|
{
|
||
|
|
unsigned long kaddr = KSEG0ADDR(pfn << PAGE_SHIFT);
|
||
|
|
int exec = vma->vm_flags & VM_EXEC;
|
||
|
|
struct mm_struct *mm = vma->vm_mm;
|
||
|
|
pgd_t *pgdp;
|
||
|
|
pud_t *pudp;
|
||
|
|
pmd_t *pmdp;
|
||
|
|
pte_t *ptep;
|
||
|
|
|
||
|
|
pr_debug("cpage[%08llx,%08lx]\n",
|
||
|
|
cpu_context(smp_processor_id(), mm), addr);
|
||
|
|
|
||
|
|
/* No ASID => no such page in the cache. */
|
||
|
|
if (cpu_context(smp_processor_id(), mm) == 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
pgdp = pgd_offset(mm, addr);
|
||
|
|
pudp = pud_offset(pgdp, addr);
|
||
|
|
pmdp = pmd_offset(pudp, addr);
|
||
|
|
ptep = pte_offset(pmdp, addr);
|
||
|
|
|
||
|
|
/* Invalid => no such page in the cache. */
|
||
|
|
if (!(pte_val(*ptep) & _PAGE_PRESENT))
|
||
|
|
return;
|
||
|
|
|
||
|
|
r3k_flush_dcache_range(kaddr, kaddr + PAGE_SIZE);
|
||
|
|
if (exec)
|
||
|
|
r3k_flush_icache_range(kaddr, kaddr + PAGE_SIZE);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void local_r3k_flush_data_cache_page(void *addr)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
static void r3k_flush_data_cache_page(unsigned long addr)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
static void r3k_flush_cache_sigtramp(unsigned long addr)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
pr_debug("csigtramp[%08lx]\n", addr);
|
||
|
|
|
||
|
|
flags = read_c0_status();
|
||
|
|
|
||
|
|
write_c0_status(flags&~ST0_IEC);
|
||
|
|
|
||
|
|
/* Fill the TLB to avoid an exception with caches isolated. */
|
||
|
|
asm( "lw\t$0, 0x000(%0)\n\t"
|
||
|
|
"lw\t$0, 0x004(%0)\n\t"
|
||
|
|
: : "r" (addr) );
|
||
|
|
|
||
|
|
write_c0_status((ST0_ISC|ST0_SWC|flags)&~ST0_IEC);
|
||
|
|
|
||
|
|
asm( "sb\t$0, 0x000(%0)\n\t"
|
||
|
|
"sb\t$0, 0x004(%0)\n\t"
|
||
|
|
: : "r" (addr) );
|
||
|
|
|
||
|
|
write_c0_status(flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void r3k_flush_kernel_vmap_range(unsigned long vaddr, int size)
|
||
|
|
{
|
||
|
|
BUG();
|
||
|
|
}
|
||
|
|
|
||
|
|
static void r3k_dma_cache_wback_inv(unsigned long start, unsigned long size)
|
||
|
|
{
|
||
|
|
/* Catch bad driver code */
|
||
|
|
BUG_ON(size == 0);
|
||
|
|
|
||
|
|
iob();
|
||
|
|
r3k_flush_dcache_range(start, start + size);
|
||
|
|
}
|
||
|
|
|
||
|
|
void r3k_cache_init(void)
|
||
|
|
{
|
||
|
|
extern void build_clear_page(void);
|
||
|
|
extern void build_copy_page(void);
|
||
|
|
|
||
|
|
r3k_probe_cache();
|
||
|
|
|
||
|
|
flush_cache_all = r3k_flush_cache_all;
|
||
|
|
__flush_cache_all = r3k___flush_cache_all;
|
||
|
|
flush_cache_mm = r3k_flush_cache_mm;
|
||
|
|
flush_cache_range = r3k_flush_cache_range;
|
||
|
|
flush_cache_page = r3k_flush_cache_page;
|
||
|
|
flush_icache_range = r3k_flush_icache_range;
|
||
|
|
local_flush_icache_range = r3k_flush_icache_range;
|
||
|
|
__flush_icache_user_range = r3k_flush_icache_range;
|
||
|
|
__local_flush_icache_user_range = r3k_flush_icache_range;
|
||
|
|
|
||
|
|
__flush_kernel_vmap_range = r3k_flush_kernel_vmap_range;
|
||
|
|
|
||
|
|
flush_cache_sigtramp = r3k_flush_cache_sigtramp;
|
||
|
|
local_flush_data_cache_page = local_r3k_flush_data_cache_page;
|
||
|
|
flush_data_cache_page = r3k_flush_data_cache_page;
|
||
|
|
|
||
|
|
_dma_cache_wback_inv = r3k_dma_cache_wback_inv;
|
||
|
|
_dma_cache_wback = r3k_dma_cache_wback_inv;
|
||
|
|
_dma_cache_inv = r3k_dma_cache_wback_inv;
|
||
|
|
|
||
|
|
printk("Primary instruction cache %ldkB, linesize %ld bytes.\n",
|
||
|
|
icache_size >> 10, icache_lsize);
|
||
|
|
printk("Primary data cache %ldkB, linesize %ld bytes.\n",
|
||
|
|
dcache_size >> 10, dcache_lsize);
|
||
|
|
|
||
|
|
build_clear_page();
|
||
|
|
build_copy_page();
|
||
|
|
}
|