r5432.c

上传linux-jx2410的源代码

/*
 * 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.
 *
 * r5432.c: NEC Vr5432 processor.  We cannot use r4xx0.c because of
 *      its unique way-selection method for indexed operations.
 *
 * Copyright (C) 1996 David S. Miller ([e-mail])
 * Copyright (C) 1997, 1998, 1999, 2000 Ralf Baechle ([e-mail])
 * Copyright (C) 2000 Jun Sun ([e-mail])
 *
 */

/*
 * [jsun]
 * In a sense, this is really silly.  We cannot re-use r4xx0.c because
 * the lowest-level indexed cache operation does not take way-selection
 * into account.  So all what I am doing here is to copy all the funcs
 * and macros (in r4kcache.h) relavent to R5432 to this file, and then
 * modify a few indexed cache operations.  *sigh*
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>

#include <asm/bcache.h>
#include <asm/io.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/bootinfo.h>
#include <asm/mmu_context.h>

/* CP0 hazard avoidance. */
#define BARRIER __asm__ __volatile__(".set noreorder\n\t" \
				     "nop; nop; nop; nop; nop; nop;\n\t" \
				     ".set reorder\n\t")

#include <asm/asm.h>
#include <asm/cacheops.h>

#undef DEBUG_CACHE

/* Primary cache parameters. */
static int icache_size, dcache_size; /* Size in bytes */
static int ic_lsize, dc_lsize;       /* LineSize in bytes */


/* -------------------------------------------------------------------- */
/* #include <asm/r4kcache.h> */

extern inline void flush_icache_line_indexed(unsigned long addr)
{
	__asm__ __volatile__(
		".set noreorder\n\t"
		".set mips3\n\t"
		"cache %1, (%0)\n\t"
		"cache %1, 1(%0)\n\t"
		".set mips0\n\t"
		".set reorder"
		:
		: "r" (addr),
		  "i" (Index_Invalidate_I));
}

extern inline void flush_dcache_line_indexed(unsigned long addr)
{
	__asm__ __volatile__(
		".set noreorder\n\t"
		".set mips3\n\t"
		"cache %1, (%0)\n\t"
		"cache %1, 1(%0)\n\t"
		".set mips0\n\t"
		".set reorder"
		:
		: "r" (addr),
		  "i" (Index_Writeback_Inv_D));
}

extern inline void flush_icache_line(unsigned long addr)
{
	__asm__ __volatile__(
		".set noreorder\n\t"
		".set mips3\n\t"
		"cache %1, (%0)\n\t"
		".set mips0\n\t"
		".set reorder"
		:
		: "r" (addr),
		  "i" (Hit_Invalidate_I));
}

extern inline void flush_dcache_line(unsigned long addr)
{
	__asm__ __volatile__(
		".set noreorder\n\t"
		".set mips3\n\t"
		"cache %1, (%0)\n\t"
		".set mips0\n\t"
		".set reorder"
		:
		: "r" (addr),
		  "i" (Hit_Writeback_Inv_D));
}

extern inline void invalidate_dcache_line(unsigned long addr)
{
	__asm__ __volatile__(
		".set noreorder\n\t"
		".set mips3\n\t"
		"cache %1, (%0)\n\t"
		".set mips0\n\t"
		".set reorder"
		:
		: "r" (addr),
		  "i" (Hit_Invalidate_D));
}


/*
 * The next two are for badland addresses like signal trampolines.
 */
extern inline void protected_flush_icache_line(unsigned long addr)
{
	__asm__ __volatile__(
		".set noreorder\n\t"
		".set mips3\n"
		"1:\tcache %1,(%0)\n"
		"2:\t.set mips0\n\t"
		".set reorder\n\t"
		".section\t__ex_table,\"a\"\n\t"
		STR(PTR)"\t1b,2b\n\t"
		".previous"
		:
		: "r" (addr),
		  "i" (Hit_Invalidate_I));
}

extern inline void protected_writeback_dcache_line(unsigned long addr)
{
	__asm__ __volatile__(
		".set noreorder\n\t"
		".set mips3\n"
		"1:\tcache %1,(%0)\n"
		"2:\t.set mips0\n\t"
		".set reorder\n\t"
		".section\t__ex_table,\"a\"\n\t"
		STR(PTR)"\t1b,2b\n\t"
		".previous"
		:
		: "r" (addr),
		  "i" (Hit_Writeback_D));
}


#define cache32_unroll32(base,op)				\
	__asm__ __volatile__("					\
		.set noreorder;					\
		.set mips3;					\
		cache %1, 0x000(%0); cache %1, 0x020(%0);	\
		cache %1, 0x040(%0); cache %1, 0x060(%0);	\
		cache %1, 0x080(%0); cache %1, 0x0a0(%0);	\
		cache %1, 0x0c0(%0); cache %1, 0x0e0(%0);	\
		cache %1, 0x100(%0); cache %1, 0x120(%0);	\
		cache %1, 0x140(%0); cache %1, 0x160(%0);	\
		cache %1, 0x180(%0); cache %1, 0x1a0(%0);	\
		cache %1, 0x1c0(%0); cache %1, 0x1e0(%0);	\
		cache %1, 0x200(%0); cache %1, 0x220(%0);	\
		cache %1, 0x240(%0); cache %1, 0x260(%0);	\
		cache %1, 0x280(%0); cache %1, 0x2a0(%0);	\
		cache %1, 0x2c0(%0); cache %1, 0x2e0(%0);	\
		cache %1, 0x300(%0); cache %1, 0x320(%0);	\
		cache %1, 0x340(%0); cache %1, 0x360(%0);	\
		cache %1, 0x380(%0); cache %1, 0x3a0(%0);	\
		cache %1, 0x3c0(%0); cache %1, 0x3e0(%0);	\
		.set mips0;					\
		.set reorder"					\
		:						\
		: "r" (base),					\
		  "i" (op));

extern inline void blast_dcache32(void)
{
	unsigned long start = KSEG0;
	unsigned long end = (start + dcache_size/2);

	while(start < end) {
		cache32_unroll32(start,Index_Writeback_Inv_D);
		cache32_unroll32(start+1,Index_Writeback_Inv_D);
		start += 0x400;
	}
}

extern inline void blast_dcache32_page(unsigned long page)
{
	unsigned long start = page;
	unsigned long end = (start + PAGE_SIZE);

	while(start < end) {
		cache32_unroll32(start,Hit_Writeback_Inv_D);
		start += 0x400;
	}
}

extern inline void blast_dcache32_page_indexed(unsigned long page)
{
	unsigned long start = page;
	unsigned long end = (start + PAGE_SIZE);

	while(start < end) {
		cache32_unroll32(start,Index_Writeback_Inv_D);
		cache32_unroll32(start+1,Index_Writeback_Inv_D);
		start += 0x400;
	}
}

extern inline void blast_icache32(void)
{
	unsigned long start = KSEG0;
	unsigned long end = (start + icache_size/2);

	while(start < end) {
		cache32_unroll32(start,Index_Invalidate_I);
		cache32_unroll32(start+1,Index_Invalidate_I);
		start += 0x400;
	}
}

extern inline void blast_icache32_page(unsigned long page)
{
	unsigned long start = page;
	unsigned long end = (start + PAGE_SIZE);

	while(start < end) {
		cache32_unroll32(start,Hit_Invalidate_I);
		start += 0x400;
	}
}

extern inline void blast_icache32_page_indexed(unsigned long page)
{
	unsigned long start = page;
	unsigned long end = (start + PAGE_SIZE);

	while(start < end) {
		cache32_unroll32(start,Index_Invalidate_I);
		cache32_unroll32(start+1,Index_Invalidate_I);
		start += 0x400;
	}
}

/* -------------------------------------------------------------------- */

static void r5432_clear_page_d32(void * page)
{
	__asm__ __volatile__(
		".set\tnoreorder\n\t"
		".set\tnoat\n\t"
		".set\tmips3\n\t"
		"daddiu\t$1,%0,%2\n"
		"1:\tcache\t%3,(%0)\n\t"
		"sd\t$0,(%0)\n\t"
		"sd\t$0,8(%0)\n\t"
		"sd\t$0,16(%0)\n\t"
		"sd\t$0,24(%0)\n\t"
		"daddiu\t%0,64\n\t"
		"cache\t%3,-32(%0)\n\t"
		"sd\t$0,-32(%0)\n\t"
		"sd\t$0,-24(%0)\n\t"
		"sd\t$0,-16(%0)\n\t"
		"bne\t$1,%0,1b\n\t"
		"sd\t$0,-8(%0)\n\t"
		".set\tmips0\n\t"
		".set\tat\n\t"
		".set\treorder"
		:"=r" (page)
		:"0" (page),
		 "I" (PAGE_SIZE),
		 "i" (Create_Dirty_Excl_D)
		:"$1","memory");
}



/*
 * This is still inefficient.  We only can do better if we know the
 * virtual address where the copy will be accessed.
 */

static void r5432_copy_page_d32(void * to, void * from)
{
	unsigned long dummy1, dummy2;
	unsigned long reg1, reg2, reg3, reg4;

	__asm__ __volatile__(
		".set\tnoreorder\n\t"
		".set\tnoat\n\t"
		".set\tmips3\n\t"
		"daddiu\t$1,%0,%8\n"
		"1:\tcache\t%9,(%0)\n\t"
		"lw\t%2,(%1)\n\t"
		"lw\t%3,4(%1)\n\t"
		"lw\t%4,8(%1)\n\t"
		"lw\t%5,12(%1)\n\t"
		"sw\t%2,(%0)\n\t"
		"sw\t%3,4(%0)\n\t"
		"sw\t%4,8(%0)\n\t"
		"sw\t%5,12(%0)\n\t"
		"lw\t%2,16(%1)\n\t"
		"lw\t%3,20(%1)\n\t"
		"lw\t%4,24(%1)\n\t"
		"lw\t%5,28(%1)\n\t"
		"sw\t%2,16(%0)\n\t"
		"sw\t%3,20(%0)\n\t"
		"sw\t%4,24(%0)\n\t"
		"sw\t%5,28(%0)\n\t"
		"cache\t%9,32(%0)\n\t"
		"daddiu\t%0,64\n\t"
		"daddiu\t%1,64\n\t"
		"lw\t%2,-32(%1)\n\t"
		"lw\t%3,-28(%1)\n\t"
		"lw\t%4,-24(%1)\n\t"
		"lw\t%5,-20(%1)\n\t"
		"sw\t%2,-32(%0)\n\t"
		"sw\t%3,-28(%0)\n\t"
		"sw\t%4,-24(%0)\n\t"
		"sw\t%5,-20(%0)\n\t"
		"lw\t%2,-16(%1)\n\t"
		"lw\t%3,-12(%1)\n\t"
		"lw\t%4,-8(%1)\n\t"
		"lw\t%5,-4(%1)\n\t"
		"sw\t%2,-16(%0)\n\t"
		"sw\t%3,-12(%0)\n\t"
		"sw\t%4,-8(%0)\n\t"
		"bne\t$1,%0,1b\n\t"
		"sw\t%5,-4(%0)\n\t"
		".set\tmips0\n\t"
		".set\tat\n\t"
		".set\treorder"
		:"=r" (dummy1), "=r" (dummy2),
		 "=&r" (reg1), "=&r" (reg2), "=&r" (reg3), "=&r" (reg4)
		:"0" (to), "1" (from),
		 "I" (PAGE_SIZE),
		 "i" (Create_Dirty_Excl_D));
}


/*
 * If you think for one second that this stuff coming up is a lot
 * of bulky code eating too many kernel cache lines.  Think _again_.
 *
 * Consider:
 * 1) Taken branches have a 3 cycle penalty on R4k
 * 2) The branch itself is a real dead cycle on even R4600/R5000.
 * 3) Only one of the following variants of each type is even used by
 *    the kernel based upon the cache parameters we detect at boot time.
 *
 * QED.
 */

static inline void r5432_flush_cache_all_d32i32(void)
{
	blast_dcache32(); blast_icache32();
}

static void r5432_flush_cache_range_d32i32(struct mm_struct *mm,
					 unsigned long start,
					 unsigned long end)
{
	if (mm->context != 0) {
#ifdef DEBUG_CACHE
		printk("crange[%d,%08lx,%08lx]", (int)mm->context, start, end);
#endif
		blast_dcache32(); blast_icache32();
	}
}

/*
 * On architectures like the Sparc, we could get rid of lines in
 * the cache created only by a certain context, but on the MIPS
 * (and actually certain Sparc's) we cannot.
 */
static void r5432_flush_cache_mm_d32i32(struct mm_struct *mm)
{
	if (mm->context != 0) {
#ifdef DEBUG_CACHE
		printk("cmm[%d]", (int)mm->context);
#endif
		r5432_flush_cache_all_d32i32();
	}
}

static void r5432_flush_cache_page_d32i32(struct vm_area_struct *vma,
					unsigned long page)
{
	struct mm_struct *mm = vma->vm_mm;
	pgd_t *pgdp;
	pmd_t *pmdp;
	pte_t *ptep;

	/*
	 * If ownes no valid ASID yet, cannot possibly have gotten
	 * this page into the cache.
	 */
	if (mm->context == 0)
		return;

#ifdef DEBUG_CACHE
	printk("cpage[%d,%08lx]", (int)mm->context, page);
#endif
	page &= PAGE_MASK;
	pgdp = pgd_offset(mm, page);
	pmdp = pmd_offset(pgdp, page);
	ptep = pte_offset(pmdp, page);

	/*
	 * If the page isn't marked valid, the page cannot possibly be
	 * in the cache.
	 */
	if (!(pte_val(*ptep) & _PAGE_PRESENT))
		return;

	/*
	 * Doing flushes for another ASID than the current one is
	 * too difficult since stupid R4k caches do a TLB translation
	 * for every cache flush operation.  So we do indexed flushes
	 * in that case, which doesn't overly flush the cache too much.
	 */
	if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {