patch-2.4.22 linux-2.4.22/arch/mips/mm/c-mips32.c

Next file: linux-2.4.22/arch/mips/mm/c-r3k.c
Previous file: linux-2.4.22/arch/mips/mm/c-andes.c
Back to the patch index
Back to the overall index

diff -urN linux-2.4.21/arch/mips/mm/c-mips32.c linux-2.4.22/arch/mips/mm/c-mips32.c
@@ -1,671 +0,0 @@
-/*
- * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
- * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
- *
- * This program is free software; you can distribute it and/or modify it
- * under the terms of the GNU General Public License (Version 2) as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
- *
- * MIPS32 CPU variant specific MMU/Cache routines.
- */
-#include <linux/config.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-
-#include <asm/bootinfo.h>
-#include <asm/cpu.h>
-#include <asm/bcache.h>
-#include <asm/io.h>
-#include <asm/page.h>
-#include <asm/pgtable.h>
-#include <asm/system.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")
-
-/* Primary cache parameters. */
-int icache_size, dcache_size; 			/* Size in bytes */
-int ic_lsize, dc_lsize;				/* LineSize in bytes */
-
-/* Secondary cache (if present) parameters. */
-unsigned int scache_size, sc_lsize;		/* Again, in bytes */
-
-#include <asm/cacheops.h>
-#include <asm/mips32_cache.h>
-
-#undef DEBUG_CACHE
-
-/*
- * Dummy cache handling routines for machines without boardcaches
- */
-static void no_sc_noop(void) {}
-
-static struct bcache_ops no_sc_ops = {
-	(void *)no_sc_noop, (void *)no_sc_noop,
-	(void *)no_sc_noop, (void *)no_sc_noop
-};
-
-struct bcache_ops *bcops = &no_sc_ops;
-
-static inline void mips32_flush_cache_all_sc(void)
-{
-	unsigned long flags;
-
-	__save_and_cli(flags);
-	blast_dcache(); blast_icache(); blast_scache();
-	__restore_flags(flags);
-}
-
-static inline void mips32_flush_cache_all_pc(void)
-{
-	unsigned long flags;
-
-	__save_and_cli(flags);
-	blast_dcache(); blast_icache();
-	__restore_flags(flags);
-}
-
-static void
-mips32_flush_cache_range_sc(struct mm_struct *mm,
-			 unsigned long start,
-			 unsigned long end)
-{
-	struct vm_area_struct *vma;
-	unsigned long flags;
-
-	if(mm->context == 0)
-		return;
-
-	start &= PAGE_MASK;
-#ifdef DEBUG_CACHE
-	printk("crange[%d,%08lx,%08lx]", (int)mm->context, start, end);
-#endif
-	vma = find_vma(mm, start);
-	if(vma) {
-		if(mm->context != current->mm->context) {
-			mips32_flush_cache_all_sc();
-		} else {
-			pgd_t *pgd;
-			pmd_t *pmd;
-			pte_t *pte;
-
-			__save_and_cli(flags);
-			while(start < end) {
-				pgd = pgd_offset(mm, start);
-				pmd = pmd_offset(pgd, start);
-				pte = pte_offset(pmd, start);
-
-				if(pte_val(*pte) & _PAGE_VALID)
-					blast_scache_page(start);
-				start += PAGE_SIZE;
-			}
-			__restore_flags(flags);
-		}
-	}
-}
-
-static void mips32_flush_cache_range_pc(struct mm_struct *mm,
-				     unsigned long start,
-				     unsigned long end)
-{
-	if(mm->context != 0) {
-		unsigned long flags;
-
-#ifdef DEBUG_CACHE
-		printk("crange[%d,%08lx,%08lx]", (int)mm->context, start, end);
-#endif
-		__save_and_cli(flags);
-		blast_dcache(); blast_icache();
-		__restore_flags(flags);
-	}
-}
-
-/*
- * 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 mips32_flush_cache_mm_sc(struct mm_struct *mm)
-{
-	if(mm->context != 0) {
-#ifdef DEBUG_CACHE
-		printk("cmm[%d]", (int)mm->context);
-#endif
-		mips32_flush_cache_all_sc();
-	}
-}
-
-static void mips32_flush_cache_mm_pc(struct mm_struct *mm)
-{
-	if(mm->context != 0) {
-#ifdef DEBUG_CACHE
-		printk("cmm[%d]", (int)mm->context);
-#endif
-		mips32_flush_cache_all_pc();
-	}
-}
-
-static void mips32_flush_cache_page_sc(struct vm_area_struct *vma,
-				    unsigned long page)
-{
-	struct mm_struct *mm = vma->vm_mm;
-	unsigned long flags;
-	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
-	__save_and_cli(flags);
-	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_VALID))
-		goto out;
-
-	/*
-	 * Doing flushes for another ASID than the current one is
-	 * too difficult since 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->context != current->active_mm->context) {
-		/*
-		 * Do indexed flush, too much work to get the (possible)
-		 * tlb refills to work correctly.
-		 */
-		page = (KSEG0 + (page & (scache_size - 1)));
-		blast_dcache_page_indexed(page);
-		blast_scache_page_indexed(page);
-	} else
-		blast_scache_page(page);
-out:
-	__restore_flags(flags);
-}
-
-static void mips32_flush_cache_page_pc(struct vm_area_struct *vma,
-				    unsigned long page)
-{
-	struct mm_struct *mm = vma->vm_mm;
-	unsigned long flags;
-	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
-	__save_and_cli(flags);
-	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_VALID))
-		goto out;
-
-	/*
-	 * Doing flushes for another ASID than the current one is
-	 * too difficult since Mips32 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) {
-		blast_dcache_page(page);
-	} else {
-		/* Do indexed flush, too much work to get the (possible)
-		 * tlb refills to work correctly.
-		 */
-		page = (KSEG0 + (page & (dcache_size - 1)));
-		blast_dcache_page_indexed(page);
-	}
-out:
-	__restore_flags(flags);
-}
-
-/* If the addresses passed to these routines are valid, they are
- * either:
- *
- * 1) In KSEG0, so we can do a direct flush of the page.
- * 2) In KSEG2, and since every process can translate those
- *    addresses all the time in kernel mode we can do a direct
- *    flush.
- * 3) In KSEG1, no flush necessary.
- */
-static void mips32_flush_page_to_ram_sc(struct page *page)
-{
-	blast_scache_page((unsigned long)page_address(page));
-}
-
-static void mips32_flush_page_to_ram_pc(struct page *page)
-{
-	blast_dcache_page((unsigned long)page_address(page));
-}
-
-static void
-mips32_flush_icache_page_s(struct vm_area_struct *vma, struct page *page)
-{
-	/*
-	 * We did an scache flush therefore PI is already clean.
-	 */
-}
-
-static void
-mips32_flush_icache_range(unsigned long start, unsigned long end)
-{
-	flush_cache_all();
-}
-
-static void
-mips32_flush_icache_page(struct vm_area_struct *vma, struct page *page)
-{
-	int address;
-
-	if (!(vma->vm_flags & VM_EXEC))
-		return;
-
-	address = KSEG0 + ((unsigned long)page_address(page) & PAGE_MASK & (dcache_size - 1));
-	blast_icache_page_indexed(address);
-}
-
-/*
- * Writeback and invalidate the primary cache dcache before DMA.
- */
-static void
-mips32_dma_cache_wback_inv_pc(unsigned long addr, unsigned long size)
-{
-	unsigned long end, a;
-	unsigned int flags;
-
-	if (size >= dcache_size) {
-		flush_cache_all();
-	} else {
-	        __save_and_cli(flags);
-		a = addr & ~(dc_lsize - 1);
-		end = (addr + size) & ~(dc_lsize - 1);
-		while (1) {
-			flush_dcache_line(a); /* Hit_Writeback_Inv_D */
-			if (a == end) break;
-			a += dc_lsize;
-		}
-		__restore_flags(flags);
-	}
-	bc_wback_inv(addr, size);
-}
-
-static void
-mips32_dma_cache_wback_inv_sc(unsigned long addr, unsigned long size)
-{
-	unsigned long end, a;
-
-	if (size >= scache_size) {
-		flush_cache_all();
-		return;
-	}
-
-	a = addr & ~(sc_lsize - 1);
-	end = (addr + size) & ~(sc_lsize - 1);
-	while (1) {
-		flush_scache_line(a);	/* Hit_Writeback_Inv_SD */
-		if (a == end) break;
-		a += sc_lsize;
-	}
-}
-
-static void
-mips32_dma_cache_inv_pc(unsigned long addr, unsigned long size)
-{
-	unsigned long end, a;
-	unsigned int flags;
-
-	if (size >= dcache_size) {
-		flush_cache_all();
-	} else {
-	        __save_and_cli(flags);
-		a = addr & ~(dc_lsize - 1);
-		end = (addr + size) & ~(dc_lsize - 1);
-		while (1) {
-			flush_dcache_line(a); /* Hit_Writeback_Inv_D */
-			if (a == end) break;
-			a += dc_lsize;
-		}
-		__restore_flags(flags);
-	}
-
-	bc_inv(addr, size);
-}
-
-static void
-mips32_dma_cache_inv_sc(unsigned long addr, unsigned long size)
-{
-	unsigned long end, a;
-
-	if (size >= scache_size) {
-		flush_cache_all();
-		return;
-	}
-
-	a = addr & ~(sc_lsize - 1);
-	end = (addr + size) & ~(sc_lsize - 1);
-	while (1) {
-		flush_scache_line(a); /* Hit_Writeback_Inv_SD */
-		if (a == end) break;
-		a += sc_lsize;
-	}
-}
-
-static void
-mips32_dma_cache_wback(unsigned long addr, unsigned long size)
-{
-	panic("mips32_dma_cache called - should not happen.");
-}
-
-/*
- * While we're protected against bad userland addresses we don't care
- * very much about what happens in that case.  Usually a segmentation
- * fault will dump the process later on anyway ...
- */
-static void mips32_flush_cache_sigtramp(unsigned long addr)
-{
-	protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
-	protected_flush_icache_line(addr & ~(ic_lsize - 1));
-}
-
-static void mips32_flush_icache_all(void)
-{
-	if (mips_cpu.cputype == CPU_20KC) {
-		blast_icache();
-	}
-}
-
-/* Detect and size the various caches. */
-static void __init probe_icache(unsigned long config)
-{
-        unsigned long config1;
-	unsigned int lsize;
-
-        if (!(config & (1 << 31))) {
-	        /*
-		 * Not a MIPS32 complainant CPU.
-		 * Config 1 register not supported, we assume R4k style.
-		 */
-	        icache_size = 1 << (12 + ((config >> 9) & 7));
-		ic_lsize = 16 << ((config >> 5) & 1);
-		mips_cpu.icache.linesz = ic_lsize;
-
-		/*
-		 * We cannot infer associativity - assume direct map
-		 * unless probe template indicates otherwise
-		 */
-		if(!mips_cpu.icache.ways) mips_cpu.icache.ways = 1;
-		mips_cpu.icache.sets =
-			(icache_size / ic_lsize) / mips_cpu.icache.ways;
-	} else {
-	       config1 = read_mips32_cp0_config1();
-
-	       if ((lsize = ((config1 >> 19) & 7)))
-		       mips_cpu.icache.linesz = 2 << lsize;
-	       else
-		       mips_cpu.icache.linesz = lsize;
-	       mips_cpu.icache.sets = 64 << ((config1 >> 22) & 7);
-	       mips_cpu.icache.ways = 1 + ((config1 >> 16) & 7);
-
-	       ic_lsize = mips_cpu.icache.linesz;
-	       icache_size = mips_cpu.icache.sets * mips_cpu.icache.ways *
-		             ic_lsize;
-	}
-	printk("Primary instruction cache %dkb, linesize %d bytes (%d ways)\n",
-	       icache_size >> 10, ic_lsize, mips_cpu.icache.ways);
-}
-
-static void __init probe_dcache(unsigned long config)
-{
-        unsigned long config1;
-	unsigned int lsize;
-
-        if (!(config & (1 << 31))) {
-	        /*
-		 * Not a MIPS32 complainant CPU.
-		 * Config 1 register not supported, we assume R4k style.
-		 */
-		dcache_size = 1 << (12 + ((config >> 6) & 7));
-		dc_lsize = 16 << ((config >> 4) & 1);
-		mips_cpu.dcache.linesz = dc_lsize;
-		/*
-		 * We cannot infer associativity - assume direct map
-		 * unless probe template indicates otherwise
-		 */
-		if(!mips_cpu.dcache.ways) mips_cpu.dcache.ways = 1;
-		mips_cpu.dcache.sets =
-			(dcache_size / dc_lsize) / mips_cpu.dcache.ways;
-	} else {
-	        config1 = read_mips32_cp0_config1();
-
-		if ((lsize = ((config1 >> 10) & 7)))
-		        mips_cpu.dcache.linesz = 2 << lsize;
-		else
-		        mips_cpu.dcache.linesz= lsize;
-		mips_cpu.dcache.sets = 64 << ((config1 >> 13) & 7);
-		mips_cpu.dcache.ways = 1 + ((config1 >> 7) & 7);
-
-		dc_lsize = mips_cpu.dcache.linesz;
-		dcache_size =
-			mips_cpu.dcache.sets * mips_cpu.dcache.ways
-			* dc_lsize;
-	}
-	printk("Primary data cache %dkb, linesize %d bytes (%d ways)\n",
-	       dcache_size >> 10, dc_lsize, mips_cpu.dcache.ways);
-}
-
-
-/* If you even _breathe_ on this function, look at the gcc output
- * and make sure it does not pop things on and off the stack for
- * the cache sizing loop that executes in KSEG1 space or else
- * you will crash and burn badly.  You have been warned.
- */
-static int __init probe_scache(unsigned long config)
-{
-	extern unsigned long stext;
-	unsigned long flags, addr, begin, end, pow2;
-	int tmp;
-
-	if (mips_cpu.scache.flags == MIPS_CACHE_NOT_PRESENT)
-		return 0;
-
-	tmp = ((config >> 17) & 1);
-	if(tmp)
-		return 0;
-	tmp = ((config >> 22) & 3);
-	switch(tmp) {
-	case 0:
-		sc_lsize = 16;
-		break;
-	case 1:
-		sc_lsize = 32;
-		break;
-	case 2:
-		sc_lsize = 64;
-		break;
-	case 3:
-		sc_lsize = 128;
-		break;
-	}
-
-	begin = (unsigned long) &stext;
-	begin &= ~((4 * 1024 * 1024) - 1);
-	end = begin + (4 * 1024 * 1024);
-
-	/* This is such a bitch, you'd think they would make it
-	 * easy to do this.  Away you daemons of stupidity!
-	 */
-	__save_and_cli(flags);
-
-	/* Fill each size-multiple cache line with a valid tag. */
-	pow2 = (64 * 1024);
-	for(addr = begin; addr < end; addr = (begin + pow2)) {
-		unsigned long *p = (unsigned long *) addr;
-		__asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
-		pow2 <<= 1;
-	}
-
-	/* Load first line with zero (therefore invalid) tag. */
-	set_taglo(0);
-	set_taghi(0);
-	__asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
-	__asm__ __volatile__("\n\t.set noreorder\n\t"
-			     ".set mips3\n\t"
-			     "cache 8, (%0)\n\t"
-			     ".set mips0\n\t"
-			     ".set reorder\n\t" : : "r" (begin));
-	__asm__ __volatile__("\n\t.set noreorder\n\t"
-			     ".set mips3\n\t"
-			     "cache 9, (%0)\n\t"
-			     ".set mips0\n\t"
-			     ".set reorder\n\t" : : "r" (begin));
-	__asm__ __volatile__("\n\t.set noreorder\n\t"
-			     ".set mips3\n\t"
-			     "cache 11, (%0)\n\t"
-			     ".set mips0\n\t"
-			     ".set reorder\n\t" : : "r" (begin));
-
-	/* Now search for the wrap around point. */
-	pow2 = (128 * 1024);
-	tmp = 0;
-	for(addr = (begin + (128 * 1024)); addr < (end); addr = (begin + pow2)) {
-		__asm__ __volatile__("\n\t.set noreorder\n\t"
-				     ".set mips3\n\t"
-				     "cache 7, (%0)\n\t"
-				     ".set mips0\n\t"
-				     ".set reorder\n\t" : : "r" (addr));
-		__asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
-		if(!get_taglo())
-			break;
-		pow2 <<= 1;
-	}
-	__restore_flags(flags);
-	addr -= begin;
-	printk("Secondary cache sized at %dK linesize %d bytes.\n",
-	       (int) (addr >> 10), sc_lsize);
-	scache_size = addr;
-	return 1;
-}
-
-static void __init setup_noscache_funcs(void)
-{
-	_clear_page = (void *)mips32_clear_page_dc;
-	_copy_page = (void *)mips32_copy_page_dc;
-	_flush_cache_all = mips32_flush_cache_all_pc;
-	___flush_cache_all = mips32_flush_cache_all_pc;
-	_flush_cache_mm = mips32_flush_cache_mm_pc;
-	_flush_cache_range = mips32_flush_cache_range_pc;
-	_flush_cache_page = mips32_flush_cache_page_pc;
-	_flush_page_to_ram = mips32_flush_page_to_ram_pc;
-
-	_flush_icache_page = mips32_flush_icache_page;
-
-	_dma_cache_wback_inv = mips32_dma_cache_wback_inv_pc;
-	_dma_cache_wback = mips32_dma_cache_wback;
-	_dma_cache_inv = mips32_dma_cache_inv_pc;
-}
-
-static void __init setup_scache_funcs(void)
-{
-        _flush_cache_all = mips32_flush_cache_all_sc;
-        ___flush_cache_all = mips32_flush_cache_all_sc;
-	_flush_cache_mm = mips32_flush_cache_mm_sc;
-	_flush_cache_range = mips32_flush_cache_range_sc;
-	_flush_cache_page = mips32_flush_cache_page_sc;
-	_flush_page_to_ram = mips32_flush_page_to_ram_sc;
-	_clear_page = (void *)mips32_clear_page_sc;
-	_copy_page = (void *)mips32_copy_page_sc;
-
-	_flush_icache_page = mips32_flush_icache_page_s;
-
-	_dma_cache_wback_inv = mips32_dma_cache_wback_inv_sc;
-	_dma_cache_wback = mips32_dma_cache_wback;
-	_dma_cache_inv = mips32_dma_cache_inv_sc;
-}
-
-typedef int (*probe_func_t)(unsigned long);
-
-static inline void __init setup_scache(unsigned int config)
-{
-	probe_func_t probe_scache_kseg1;
-	int sc_present = 0;
-
-	/* Maybe the cpu knows about a l2 cache? */
-	probe_scache_kseg1 = (probe_func_t) (KSEG1ADDR(&probe_scache));
-	sc_present = probe_scache_kseg1(config);
-
-	if (sc_present) {
-	  	mips_cpu.scache.linesz = sc_lsize;
-		/*
-		 * We cannot infer associativity - assume direct map
-		 * unless probe template indicates otherwise
-		 */
-		if(!mips_cpu.scache.ways) mips_cpu.scache.ways = 1;
-		mips_cpu.scache.sets =
-		  (scache_size / sc_lsize) / mips_cpu.scache.ways;
-
-		setup_scache_funcs();
-		return;
-	}
-
-	setup_noscache_funcs();
-}
-
-void __init ld_mmu_mips32(void)
-{
-	unsigned long config = read_32bit_cp0_register(CP0_CONFIG);
-
-	change_cp0_config(CONF_CM_CMASK, CONF_CM_DEFAULT);
-
-	probe_icache(config);
-	probe_dcache(config);
-	setup_scache(config);
-
-	_flush_cache_sigtramp = mips32_flush_cache_sigtramp;
-	_flush_icache_range = mips32_flush_icache_range;	/* Ouch */
-	_flush_icache_all = mips32_flush_icache_all;
-
-	__flush_cache_all();
-}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)