r5432.c
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上传日期:2013-02-24
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文件大小:21k
- /*
- * 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 (dm@engr.sgi.com)
- * Copyright (C) 1997, 1998, 1999, 2000 Ralf Baechle (ralf@gnu.org)
- * Copyright (C) 2000 Jun Sun (jsun@mvista.com)
- *
- */
- /*
- * [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 noreordernt"
- "nop; nop; nop; nop; nop; nop;nt"
- ".set reordernt")
- #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 noreordernt"
- ".set mips3nt"
- "cache %1, (%0)nt"
- "cache %1, 1(%0)nt"
- ".set mips0nt"
- ".set reorder"
- :
- : "r" (addr),
- "i" (Index_Invalidate_I));
- }
- extern inline void flush_dcache_line_indexed(unsigned long addr)
- {
- __asm__ __volatile__(
- ".set noreordernt"
- ".set mips3nt"
- "cache %1, (%0)nt"
- "cache %1, 1(%0)nt"
- ".set mips0nt"
- ".set reorder"
- :
- : "r" (addr),
- "i" (Index_Writeback_Inv_D));
- }
- extern inline void flush_icache_line(unsigned long addr)
- {
- __asm__ __volatile__(
- ".set noreordernt"
- ".set mips3nt"
- "cache %1, (%0)nt"
- ".set mips0nt"
- ".set reorder"
- :
- : "r" (addr),
- "i" (Hit_Invalidate_I));
- }
- extern inline void flush_dcache_line(unsigned long addr)
- {
- __asm__ __volatile__(
- ".set noreordernt"
- ".set mips3nt"
- "cache %1, (%0)nt"
- ".set mips0nt"
- ".set reorder"
- :
- : "r" (addr),
- "i" (Hit_Writeback_Inv_D));
- }
- extern inline void invalidate_dcache_line(unsigned long addr)
- {
- __asm__ __volatile__(
- ".set noreordernt"
- ".set mips3nt"
- "cache %1, (%0)nt"
- ".set mips0nt"
- ".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 noreordernt"
- ".set mips3n"
- "1:tcache %1,(%0)n"
- "2:t.set mips0nt"
- ".set reordernt"
- ".sectiont__ex_table,"a"nt"
- STR(PTR)"t1b,2bnt"
- ".previous"
- :
- : "r" (addr),
- "i" (Hit_Invalidate_I));
- }
- extern inline void protected_writeback_dcache_line(unsigned long addr)
- {
- __asm__ __volatile__(
- ".set noreordernt"
- ".set mips3n"
- "1:tcache %1,(%0)n"
- "2:t.set mips0nt"
- ".set reordernt"
- ".sectiont__ex_table,"a"nt"
- STR(PTR)"t1b,2bnt"
- ".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__(
- ".settnoreordernt"
- ".settnoatnt"
- ".settmips3nt"
- "daddiut$1,%0,%2n"
- "1:tcachet%3,(%0)nt"
- "sdt$0,(%0)nt"
- "sdt$0,8(%0)nt"
- "sdt$0,16(%0)nt"
- "sdt$0,24(%0)nt"
- "daddiut%0,64nt"
- "cachet%3,-32(%0)nt"
- "sdt$0,-32(%0)nt"
- "sdt$0,-24(%0)nt"
- "sdt$0,-16(%0)nt"
- "bnet$1,%0,1bnt"
- "sdt$0,-8(%0)nt"
- ".settmips0nt"
- ".settatnt"
- ".settreorder"
- :"=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__(
- ".settnoreordernt"
- ".settnoatnt"
- ".settmips3nt"
- "daddiut$1,%0,%8n"
- "1:tcachet%9,(%0)nt"
- "lwt%2,(%1)nt"
- "lwt%3,4(%1)nt"
- "lwt%4,8(%1)nt"
- "lwt%5,12(%1)nt"
- "swt%2,(%0)nt"
- "swt%3,4(%0)nt"
- "swt%4,8(%0)nt"
- "swt%5,12(%0)nt"
- "lwt%2,16(%1)nt"
- "lwt%3,20(%1)nt"
- "lwt%4,24(%1)nt"
- "lwt%5,28(%1)nt"
- "swt%2,16(%0)nt"
- "swt%3,20(%0)nt"
- "swt%4,24(%0)nt"
- "swt%5,28(%0)nt"
- "cachet%9,32(%0)nt"
- "daddiut%0,64nt"
- "daddiut%1,64nt"
- "lwt%2,-32(%1)nt"
- "lwt%3,-28(%1)nt"
- "lwt%4,-24(%1)nt"
- "lwt%5,-20(%1)nt"
- "swt%2,-32(%0)nt"
- "swt%3,-28(%0)nt"
- "swt%4,-24(%0)nt"
- "swt%5,-20(%0)nt"
- "lwt%2,-16(%1)nt"
- "lwt%3,-12(%1)nt"
- "lwt%4,-8(%1)nt"
- "lwt%5,-4(%1)nt"
- "swt%2,-16(%0)nt"
- "swt%3,-12(%0)nt"
- "swt%4,-8(%0)nt"
- "bnet$1,%0,1bnt"
- "swt%5,-4(%0)nt"
- ".settmips0nt"
- ".settatnt"
- ".settreorder"
- :"=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)) {
- blast_dcache32_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_dcache32_page_indexed(page);
- }
- }
- /* 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 r5432_flush_page_to_ram_d32(struct page *page)
- {
- blast_dcache32_page((unsigned long)page_address(page));
- }
- static void
- r5432_flush_icache_range(unsigned long start, unsigned long end)
- {
- r5432_flush_cache_all_d32i32();
- }
- /*
- * Ok, this seriously sucks. We use them to flush a user page but don't
- * know the virtual address, so we have to blast away the whole icache
- * which is significantly more expensive than the real thing.
- */
- static void
- r5432_flush_icache_page_i32(struct vm_area_struct *vma, struct page *page)
- {
- if (!(vma->vm_flags & VM_EXEC))
- return;
- r5432_flush_cache_all_d32i32();
- }
- /*
- * Writeback and invalidate the primary cache dcache before DMA.
- */
- static void
- r5432_dma_cache_wback_inv_pc(unsigned long addr, unsigned long size)
- {
- unsigned long end, a;
- if (size >= dcache_size) {
- flush_cache_all();
- } else {
- 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;
- }
- }
- bc_wback_inv(addr, size);
- }
- static void
- r5432_dma_cache_inv_pc(unsigned long addr, unsigned long size)
- {
- unsigned long end, a;
- if (size >= dcache_size) {
- flush_cache_all();
- } else {
- 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;
- }
- }
- bc_inv(addr, size);
- }
- static void
- r5432_dma_cache_wback(unsigned long addr, unsigned long size)
- {
- panic("r5432_dma_cache called - should not happen.n");
- }
- /*
- * 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 r5432_flush_cache_sigtramp(unsigned long addr)
- {
- protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
- protected_flush_icache_line(addr & ~(ic_lsize - 1));
- }
- #undef DEBUG_TLB
- #undef DEBUG_TLBUPDATE
- #define NTLB_ENTRIES 48 /* Fixed on all R4XX0 variants... */
- #define NTLB_ENTRIES_HALF 24 /* Fixed on all R4XX0 variants... */
- void flush_tlb_all(void)
- {
- unsigned long old_ctx;
- int entry;
- unsigned long flags;
- #ifdef DEBUG_TLB
- printk("[tlball]");
- #endif
- __save_and_cli(flags);
- /* Save old context and create impossible VPN2 value */
- old_ctx = (get_entryhi() & 0xff);
- set_entryhi(KSEG0);
- set_entrylo0(0);
- set_entrylo1(0);
- BARRIER;
- entry = get_wired();
- /* Blast 'em all away. */
- while(entry < NTLB_ENTRIES) {
- set_index(entry);
- BARRIER;
- tlb_write_indexed();
- BARRIER;
- entry++;
- }
- BARRIER;
- set_entryhi(old_ctx);
- __restore_flags(flags);
- }
- void flush_tlb_mm(struct mm_struct *mm)
- {
- if (mm->context != 0) {
- unsigned long flags;
- #ifdef DEBUG_TLB
- printk("[tlbmm<%d>]", mm->context);
- #endif
- __save_and_cli(flags);
- get_new_mmu_context(mm, asid_cache);
- if (mm == current->active_mm)
- set_entryhi(mm->context & 0xff);
- __restore_flags(flags);
- }
- }
- void flush_tlb_range(struct mm_struct *mm, unsigned long start,
- unsigned long end)
- {
- if(mm->context != 0) {
- unsigned long flags;
- int size;
- #ifdef DEBUG_TLB
- printk("[tlbrange<%02x,%08lx,%08lx>]", (mm->context & 0xff),
- start, end);
- #endif
- __save_and_cli(flags);
- size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
- size = (size + 1) >> 1;
- if(size <= NTLB_ENTRIES_HALF) {
- int oldpid = (get_entryhi() & 0xff);
- int newpid = (mm->context & 0xff);
- start &= (PAGE_MASK << 1);
- end += ((PAGE_SIZE << 1) - 1);
- end &= (PAGE_MASK << 1);
- while(start < end) {
- int idx;
- set_entryhi(start | newpid);
- start += (PAGE_SIZE << 1);
- BARRIER;
- tlb_probe();
- BARRIER;
- idx = get_index();
- set_entrylo0(0);
- set_entrylo1(0);
- set_entryhi(KSEG0);
- BARRIER;
- if(idx < 0)
- continue;
- tlb_write_indexed();
- BARRIER;
- }
- set_entryhi(oldpid);
- } else {
- get_new_mmu_context(mm, asid_cache);
- if (mm == current->active_mm)
- set_entryhi(mm->context & 0xff);
- }
- __restore_flags(flags);
- }
- }
- void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
- {
- if (vma->vm_mm->context != 0) {
- unsigned long flags;
- int oldpid, newpid, idx;
- #ifdef DEBUG_TLB
- printk("[tlbpage<%d,%08lx>]", vma->vm_mm->context, page);
- #endif
- newpid = (vma->vm_mm->context & 0xff);
- page &= (PAGE_MASK << 1);
- __save_and_cli(flags);
- oldpid = (get_entryhi() & 0xff);
- set_entryhi(page | newpid);
- BARRIER;
- tlb_probe();
- BARRIER;
- idx = get_index();
- set_entrylo0(0);
- set_entrylo1(0);
- set_entryhi(KSEG0);
- if(idx < 0)
- goto finish;
- BARRIER;
- tlb_write_indexed();
- finish:
- BARRIER;
- set_entryhi(oldpid);
- __restore_flags(flags);
- }
- }
- void pgd_init(unsigned long page)
- {
- unsigned long *p = (unsigned long *) page;
- int i;
- for(i = 0; i < USER_PTRS_PER_PGD; i+=8) {
- p[i + 0] = (unsigned long) invalid_pte_table;
- p[i + 1] = (unsigned long) invalid_pte_table;
- p[i + 2] = (unsigned long) invalid_pte_table;
- p[i + 3] = (unsigned long) invalid_pte_table;
- p[i + 4] = (unsigned long) invalid_pte_table;
- p[i + 5] = (unsigned long) invalid_pte_table;
- p[i + 6] = (unsigned long) invalid_pte_table;
- p[i + 7] = (unsigned long) invalid_pte_table;
- }
- }
- /* We will need multiple versions of update_mmu_cache(), one that just
- * updates the TLB with the new pte(s), and another which also checks
- * for the R4k "end of page" hardware bug and does the needy.
- */
- void update_mmu_cache(struct vm_area_struct * vma,
- unsigned long address, pte_t pte)
- {
- unsigned long flags;
- pgd_t *pgdp;
- pmd_t *pmdp;
- pte_t *ptep;
- int idx, pid;
- /*
- * Handle debugger faulting in for debugee.
- */
- if (current->active_mm != vma->vm_mm)
- return;
- pid = get_entryhi() & 0xff;
- #ifdef DEBUG_TLB
- if((pid != (vma->vm_mm->context & 0xff)) || (vma->vm_mm->context == 0)) {
- printk("update_mmu_cache: Wheee, bogus tlbpid mmpid=%d tlbpid=%dn",
- (int) (vma->vm_mm->context & 0xff), pid);
- }
- #endif
- __save_and_cli(flags);
- address &= (PAGE_MASK << 1);
- set_entryhi(address | (pid));
- pgdp = pgd_offset(vma->vm_mm, address);
- BARRIER;
- tlb_probe();
- BARRIER;
- pmdp = pmd_offset(pgdp, address);
- idx = get_index();
- ptep = pte_offset(pmdp, address);
- BARRIER;
- set_entrylo0(pte_val(*ptep++) >> 6);
- set_entrylo1(pte_val(*ptep) >> 6);
- set_entryhi(address | (pid));
- BARRIER;
- if(idx < 0) {
- tlb_write_random();
- } else {
- tlb_write_indexed();
- }
- BARRIER;
- set_entryhi(pid);
- BARRIER;
- __restore_flags(flags);
- }
- void show_regs(struct pt_regs * regs)
- {
- /* Saved main processor registers. */
- printk("$0 : %08lx %08lx %08lx %08lxn",
- 0UL, regs->regs[1], regs->regs[2], regs->regs[3]);
- printk("$4 : %08lx %08lx %08lx %08lxn",
- regs->regs[4], regs->regs[5], regs->regs[6], regs->regs[7]);
- printk("$8 : %08lx %08lx %08lx %08lxn",
- regs->regs[8], regs->regs[9], regs->regs[10], regs->regs[11]);
- printk("$12: %08lx %08lx %08lx %08lxn",
- regs->regs[12], regs->regs[13], regs->regs[14], regs->regs[15]);
- printk("$16: %08lx %08lx %08lx %08lxn",
- regs->regs[16], regs->regs[17], regs->regs[18], regs->regs[19]);
- printk("$20: %08lx %08lx %08lx %08lxn",
- regs->regs[20], regs->regs[21], regs->regs[22], regs->regs[23]);
- printk("$24: %08lx %08lxn",
- regs->regs[24], regs->regs[25]);
- printk("$28: %08lx %08lx %08lx %08lxn",
- regs->regs[28], regs->regs[29], regs->regs[30], regs->regs[31]);
- /* Saved cp0 registers. */
- printk("epc : %08lx %snStatus: %08lxnCause : %08lxn",
- regs->cp0_epc, print_tainted(), regs->cp0_status, regs->cp0_cause);
- }
-
- void add_wired_entry(unsigned long entrylo0, unsigned long entrylo1,
- unsigned long entryhi, unsigned long pagemask)
- {
- unsigned long flags;
- unsigned long wired;
- unsigned long old_pagemask;
- unsigned long old_ctx;
- __save_and_cli(flags);
- /* Save old context and create impossible VPN2 value */
- old_ctx = (get_entryhi() & 0xff);
- old_pagemask = get_pagemask();
- wired = get_wired();
- set_wired (wired + 1);
- set_index (wired);
- BARRIER;
- set_pagemask (pagemask);
- set_entryhi(entryhi);
- set_entrylo0(entrylo0);
- set_entrylo1(entrylo1);
- BARRIER;
- tlb_write_indexed();
- BARRIER;
-
- set_entryhi(old_ctx);
- BARRIER;
- set_pagemask (old_pagemask);
- flush_tlb_all();
- __restore_flags(flags);
- }
- /* Detect and size the various r4k caches. */
- static void __init probe_icache(unsigned long config)
- {
- icache_size = 1 << (12 + ((config >> 9) & 7));
- ic_lsize = 16 << ((config >> 5) & 1);
- printk("Primary instruction cache %dkb, linesize %d bytes.n",
- icache_size >> 10, ic_lsize);
- }
- static void __init probe_dcache(unsigned long config)
- {
- dcache_size = 1 << (12 + ((config >> 6) & 7));
- dc_lsize = 16 << ((config >> 4) & 1);
- printk("Primary data cache %dkb, linesize %d bytes.n",
- dcache_size >> 10, dc_lsize);
- }
- void __init ld_mmu_r5432(void)
- {
- unsigned long config = read_32bit_cp0_register(CP0_CONFIG);
- printk("CPU revision is: %08xn", read_32bit_cp0_register(CP0_PRID));
- change_cp0_config(CONF_CM_CMASK, CONF_CM_CACHABLE_NONCOHERENT);
- probe_icache(config);
- probe_dcache(config);
- _clear_page = r5432_clear_page_d32;
- _copy_page = r5432_copy_page_d32;
- _flush_cache_all = r5432_flush_cache_all_d32i32;
- ___flush_cache_all = r5432_flush_cache_all_d32i32;
- _flush_page_to_ram = r5432_flush_page_to_ram_d32;
- _flush_cache_mm = r5432_flush_cache_mm_d32i32;
- _flush_cache_range = r5432_flush_cache_range_d32i32;
- _flush_cache_page = r5432_flush_cache_page_d32i32;
- _flush_icache_page = r5432_flush_icache_page_i32;
- _dma_cache_wback_inv = r5432_dma_cache_wback_inv_pc;
- _dma_cache_wback = r5432_dma_cache_wback;
- _dma_cache_inv = r5432_dma_cache_inv_pc;
- _flush_cache_sigtramp = r5432_flush_cache_sigtramp;
- _flush_icache_range = r5432_flush_icache_range; /* Ouch */
- __flush_cache_all();
- write_32bit_cp0_register(CP0_WIRED, 0);
- /*
- * You should never change this register:
- * - On R4600 1.7 the tlbp never hits for pages smaller than
- * the value in the c0_pagemask register.
- * - The entire mm handling assumes the c0_pagemask register to
- * be set for 4kb pages.
- */
- write_32bit_cp0_register(CP0_PAGEMASK, PM_4K);
- flush_tlb_all();
- }