mirror of
https://github.com/torvalds/linux.git
synced 2024-12-22 02:52:56 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
363 lines
8.8 KiB
C
363 lines
8.8 KiB
C
/*
|
|
* arch/sh/mm/cache-sh4.c
|
|
*
|
|
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
|
|
* Copyright (C) 2001, 2002, 2003, 2004 Paul Mundt
|
|
* Copyright (C) 2003 Richard Curnow
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/init.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/threads.h>
|
|
#include <asm/addrspace.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/cache.h>
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
extern void __flush_cache_4096_all(unsigned long start);
|
|
static void __flush_cache_4096_all_ex(unsigned long start);
|
|
extern void __flush_dcache_all(void);
|
|
static void __flush_dcache_all_ex(void);
|
|
|
|
/*
|
|
* SH-4 has virtually indexed and physically tagged cache.
|
|
*/
|
|
|
|
struct semaphore p3map_sem[4];
|
|
|
|
void __init p3_cache_init(void)
|
|
{
|
|
if (remap_area_pages(P3SEG, 0, PAGE_SIZE*4, _PAGE_CACHABLE))
|
|
panic("%s failed.", __FUNCTION__);
|
|
|
|
sema_init (&p3map_sem[0], 1);
|
|
sema_init (&p3map_sem[1], 1);
|
|
sema_init (&p3map_sem[2], 1);
|
|
sema_init (&p3map_sem[3], 1);
|
|
}
|
|
|
|
/*
|
|
* Write back the dirty D-caches, but not invalidate them.
|
|
*
|
|
* START: Virtual Address (U0, P1, or P3)
|
|
* SIZE: Size of the region.
|
|
*/
|
|
void __flush_wback_region(void *start, int size)
|
|
{
|
|
unsigned long v;
|
|
unsigned long begin, end;
|
|
|
|
begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
|
|
end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
|
|
& ~(L1_CACHE_BYTES-1);
|
|
for (v = begin; v < end; v+=L1_CACHE_BYTES) {
|
|
asm volatile("ocbwb %0"
|
|
: /* no output */
|
|
: "m" (__m(v)));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Write back the dirty D-caches and invalidate them.
|
|
*
|
|
* START: Virtual Address (U0, P1, or P3)
|
|
* SIZE: Size of the region.
|
|
*/
|
|
void __flush_purge_region(void *start, int size)
|
|
{
|
|
unsigned long v;
|
|
unsigned long begin, end;
|
|
|
|
begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
|
|
end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
|
|
& ~(L1_CACHE_BYTES-1);
|
|
for (v = begin; v < end; v+=L1_CACHE_BYTES) {
|
|
asm volatile("ocbp %0"
|
|
: /* no output */
|
|
: "m" (__m(v)));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* No write back please
|
|
*/
|
|
void __flush_invalidate_region(void *start, int size)
|
|
{
|
|
unsigned long v;
|
|
unsigned long begin, end;
|
|
|
|
begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
|
|
end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
|
|
& ~(L1_CACHE_BYTES-1);
|
|
for (v = begin; v < end; v+=L1_CACHE_BYTES) {
|
|
asm volatile("ocbi %0"
|
|
: /* no output */
|
|
: "m" (__m(v)));
|
|
}
|
|
}
|
|
|
|
static void __flush_dcache_all_ex(void)
|
|
{
|
|
unsigned long addr, end_addr, entry_offset;
|
|
|
|
end_addr = CACHE_OC_ADDRESS_ARRAY + (cpu_data->dcache.sets << cpu_data->dcache.entry_shift) * cpu_data->dcache.ways;
|
|
entry_offset = 1 << cpu_data->dcache.entry_shift;
|
|
for (addr = CACHE_OC_ADDRESS_ARRAY; addr < end_addr; addr += entry_offset) {
|
|
ctrl_outl(0, addr);
|
|
}
|
|
}
|
|
|
|
static void __flush_cache_4096_all_ex(unsigned long start)
|
|
{
|
|
unsigned long addr, entry_offset;
|
|
int i;
|
|
|
|
entry_offset = 1 << cpu_data->dcache.entry_shift;
|
|
for (i = 0; i < cpu_data->dcache.ways; i++, start += cpu_data->dcache.way_incr) {
|
|
for (addr = CACHE_OC_ADDRESS_ARRAY + start;
|
|
addr < CACHE_OC_ADDRESS_ARRAY + 4096 + start;
|
|
addr += entry_offset) {
|
|
ctrl_outl(0, addr);
|
|
}
|
|
}
|
|
}
|
|
|
|
void flush_cache_4096_all(unsigned long start)
|
|
{
|
|
if (cpu_data->dcache.ways == 1)
|
|
__flush_cache_4096_all(start);
|
|
else
|
|
__flush_cache_4096_all_ex(start);
|
|
}
|
|
|
|
/*
|
|
* Write back the range of D-cache, and purge the I-cache.
|
|
*
|
|
* Called from kernel/module.c:sys_init_module and routine for a.out format.
|
|
*/
|
|
void flush_icache_range(unsigned long start, unsigned long end)
|
|
{
|
|
flush_cache_all();
|
|
}
|
|
|
|
/*
|
|
* Write back the D-cache and purge the I-cache for signal trampoline.
|
|
* .. which happens to be the same behavior as flush_icache_range().
|
|
* So, we simply flush out a line.
|
|
*/
|
|
void flush_cache_sigtramp(unsigned long addr)
|
|
{
|
|
unsigned long v, index;
|
|
unsigned long flags;
|
|
int i;
|
|
|
|
v = addr & ~(L1_CACHE_BYTES-1);
|
|
asm volatile("ocbwb %0"
|
|
: /* no output */
|
|
: "m" (__m(v)));
|
|
|
|
index = CACHE_IC_ADDRESS_ARRAY | (v & cpu_data->icache.entry_mask);
|
|
|
|
local_irq_save(flags);
|
|
jump_to_P2();
|
|
for(i = 0; i < cpu_data->icache.ways; i++, index += cpu_data->icache.way_incr)
|
|
ctrl_outl(0, index); /* Clear out Valid-bit */
|
|
back_to_P1();
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static inline void flush_cache_4096(unsigned long start,
|
|
unsigned long phys)
|
|
{
|
|
unsigned long flags;
|
|
extern void __flush_cache_4096(unsigned long addr, unsigned long phys, unsigned long exec_offset);
|
|
|
|
/*
|
|
* SH7751, SH7751R, and ST40 have no restriction to handle cache.
|
|
* (While SH7750 must do that at P2 area.)
|
|
*/
|
|
if ((cpu_data->flags & CPU_HAS_P2_FLUSH_BUG)
|
|
|| start < CACHE_OC_ADDRESS_ARRAY) {
|
|
local_irq_save(flags);
|
|
__flush_cache_4096(start | SH_CACHE_ASSOC, P1SEGADDR(phys), 0x20000000);
|
|
local_irq_restore(flags);
|
|
} else {
|
|
__flush_cache_4096(start | SH_CACHE_ASSOC, P1SEGADDR(phys), 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Write back & invalidate the D-cache of the page.
|
|
* (To avoid "alias" issues)
|
|
*/
|
|
void flush_dcache_page(struct page *page)
|
|
{
|
|
if (test_bit(PG_mapped, &page->flags)) {
|
|
unsigned long phys = PHYSADDR(page_address(page));
|
|
|
|
/* Loop all the D-cache */
|
|
flush_cache_4096(CACHE_OC_ADDRESS_ARRAY, phys);
|
|
flush_cache_4096(CACHE_OC_ADDRESS_ARRAY | 0x1000, phys);
|
|
flush_cache_4096(CACHE_OC_ADDRESS_ARRAY | 0x2000, phys);
|
|
flush_cache_4096(CACHE_OC_ADDRESS_ARRAY | 0x3000, phys);
|
|
}
|
|
}
|
|
|
|
static inline void flush_icache_all(void)
|
|
{
|
|
unsigned long flags, ccr;
|
|
|
|
local_irq_save(flags);
|
|
jump_to_P2();
|
|
|
|
/* Flush I-cache */
|
|
ccr = ctrl_inl(CCR);
|
|
ccr |= CCR_CACHE_ICI;
|
|
ctrl_outl(ccr, CCR);
|
|
|
|
back_to_P1();
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
void flush_cache_all(void)
|
|
{
|
|
if (cpu_data->dcache.ways == 1)
|
|
__flush_dcache_all();
|
|
else
|
|
__flush_dcache_all_ex();
|
|
flush_icache_all();
|
|
}
|
|
|
|
void flush_cache_mm(struct mm_struct *mm)
|
|
{
|
|
/* Is there any good way? */
|
|
/* XXX: possibly call flush_cache_range for each vm area */
|
|
/*
|
|
* FIXME: Really, the optimal solution here would be able to flush out
|
|
* individual lines created by the specified context, but this isn't
|
|
* feasible for a number of architectures (such as MIPS, and some
|
|
* SPARC) .. is this possible for SuperH?
|
|
*
|
|
* In the meantime, we'll just flush all of the caches.. this
|
|
* seems to be the simplest way to avoid at least a few wasted
|
|
* cache flushes. -Lethal
|
|
*/
|
|
flush_cache_all();
|
|
}
|
|
|
|
/*
|
|
* Write back and invalidate I/D-caches for the page.
|
|
*
|
|
* ADDR: Virtual Address (U0 address)
|
|
* PFN: Physical page number
|
|
*/
|
|
void flush_cache_page(struct vm_area_struct *vma, unsigned long address, unsigned long pfn)
|
|
{
|
|
unsigned long phys = pfn << PAGE_SHIFT;
|
|
|
|
/* We only need to flush D-cache when we have alias */
|
|
if ((address^phys) & CACHE_ALIAS) {
|
|
/* Loop 4K of the D-cache */
|
|
flush_cache_4096(
|
|
CACHE_OC_ADDRESS_ARRAY | (address & CACHE_ALIAS),
|
|
phys);
|
|
/* Loop another 4K of the D-cache */
|
|
flush_cache_4096(
|
|
CACHE_OC_ADDRESS_ARRAY | (phys & CACHE_ALIAS),
|
|
phys);
|
|
}
|
|
|
|
if (vma->vm_flags & VM_EXEC)
|
|
/* Loop 4K (half) of the I-cache */
|
|
flush_cache_4096(
|
|
CACHE_IC_ADDRESS_ARRAY | (address & 0x1000),
|
|
phys);
|
|
}
|
|
|
|
/*
|
|
* Write back and invalidate D-caches.
|
|
*
|
|
* START, END: Virtual Address (U0 address)
|
|
*
|
|
* NOTE: We need to flush the _physical_ page entry.
|
|
* Flushing the cache lines for U0 only isn't enough.
|
|
* We need to flush for P1 too, which may contain aliases.
|
|
*/
|
|
void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
|
|
unsigned long end)
|
|
{
|
|
unsigned long p = start & PAGE_MASK;
|
|
pgd_t *dir;
|
|
pmd_t *pmd;
|
|
pte_t *pte;
|
|
pte_t entry;
|
|
unsigned long phys;
|
|
unsigned long d = 0;
|
|
|
|
dir = pgd_offset(vma->vm_mm, p);
|
|
pmd = pmd_offset(dir, p);
|
|
|
|
do {
|
|
if (pmd_none(*pmd) || pmd_bad(*pmd)) {
|
|
p &= ~((1 << PMD_SHIFT) -1);
|
|
p += (1 << PMD_SHIFT);
|
|
pmd++;
|
|
continue;
|
|
}
|
|
pte = pte_offset_kernel(pmd, p);
|
|
do {
|
|
entry = *pte;
|
|
if ((pte_val(entry) & _PAGE_PRESENT)) {
|
|
phys = pte_val(entry)&PTE_PHYS_MASK;
|
|
if ((p^phys) & CACHE_ALIAS) {
|
|
d |= 1 << ((p & CACHE_ALIAS)>>12);
|
|
d |= 1 << ((phys & CACHE_ALIAS)>>12);
|
|
if (d == 0x0f)
|
|
goto loop_exit;
|
|
}
|
|
}
|
|
pte++;
|
|
p += PAGE_SIZE;
|
|
} while (p < end && ((unsigned long)pte & ~PAGE_MASK));
|
|
pmd++;
|
|
} while (p < end);
|
|
loop_exit:
|
|
if (d & 1)
|
|
flush_cache_4096_all(0);
|
|
if (d & 2)
|
|
flush_cache_4096_all(0x1000);
|
|
if (d & 4)
|
|
flush_cache_4096_all(0x2000);
|
|
if (d & 8)
|
|
flush_cache_4096_all(0x3000);
|
|
if (vma->vm_flags & VM_EXEC)
|
|
flush_icache_all();
|
|
}
|
|
|
|
/*
|
|
* flush_icache_user_range
|
|
* @vma: VMA of the process
|
|
* @page: page
|
|
* @addr: U0 address
|
|
* @len: length of the range (< page size)
|
|
*/
|
|
void flush_icache_user_range(struct vm_area_struct *vma,
|
|
struct page *page, unsigned long addr, int len)
|
|
{
|
|
flush_cache_page(vma, addr, page_to_pfn(page));
|
|
}
|
|
|