andes.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:8k
- /*
- * 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.
- *
- * Copyright (C) 1997, 1998, 1999 Ralf Baechle (ralf@gnu.org)
- * Copyright (C) 1999 Silicon Graphics, Inc.
- * Copyright (C) 2000 Kanoj Sarcar (kanoj@sgi.com)
- */
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/mm.h>
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #include <asm/r10kcache.h>
- #include <asm/system.h>
- #include <asm/mmu_context.h>
- static int scache_lsz64;
- /*
- * This version has been tuned on an Origin. For other machines the arguments
- * of the pref instructin may have to be tuned differently.
- */
- static void andes_clear_page(void * page)
- {
- __asm__ __volatile__(
- ".settnoreordernt"
- ".settnoatnt"
- "daddiut$1,%0,%2n"
- "1:tpref 7,512(%0)nt"
- "sdt$0,(%0)nt"
- "sdt$0,8(%0)nt"
- "sdt$0,16(%0)nt"
- "sdt$0,24(%0)nt"
- "daddiut%0,64nt"
- "sdt$0,-32(%0)nt"
- "sdt$0,-24(%0)nt"
- "sdt$0,-16(%0)nt"
- "bnet$1,%0,1bnt"
- "sdt$0,-8(%0)nt"
- ".settatnt"
- ".settreorder"
- : "=r" (page)
- : "0" (page), "I" (PAGE_SIZE)
- : "memory");
- }
- /* R10000 has no Create_Dirty type cacheops. */
- static void andes_copy_page(void * to, void * from)
- {
- unsigned long dummy1, dummy2, reg1, reg2, reg3, reg4;
- __asm__ __volatile__(
- ".settnoreordernt"
- ".settnoatnt"
- "daddiut$1,%0,%8n"
- "1:tpreft0,2*128(%1)nt"
- "preft1,2*128(%0)nt"
- "ldt%2,(%1)nt"
- "ldt%3,8(%1)nt"
- "ldt%4,16(%1)nt"
- "ldt%5,24(%1)nt"
- "sdt%2,(%0)nt"
- "sdt%3,8(%0)nt"
- "sdt%4,16(%0)nt"
- "sdt%5,24(%0)nt"
- "daddiut%0,64nt"
- "daddiut%1,64nt"
- "ldt%2,-32(%1)nt"
- "ldt%3,-24(%1)nt"
- "ldt%4,-16(%1)nt"
- "ldt%5,-8(%1)nt"
- "sdt%2,-32(%0)nt"
- "sdt%3,-24(%0)nt"
- "sdt%4,-16(%0)nt"
- "bnet$1,%0,1bnt"
- " sdt%5,-8(%0)nt"
- ".settatnt"
- ".settreorder"
- :"=r" (dummy1), "=r" (dummy2), "=&r" (reg1), "=&r" (reg2),
- "=&r" (reg3), "=&r" (reg4)
- :"0" (to), "1" (from), "I" (PAGE_SIZE));
- }
- /* Cache operations. These are only used with the virtual memory system,
- not for non-coherent I/O so it's ok to ignore the secondary caches. */
- static void
- andes_flush_cache_l1(void)
- {
- blast_dcache32(); blast_icache64();
- }
- /*
- * This is only used during initialization time. vmalloc() also calls
- * this, but that will be changed pretty soon.
- */
- static void andes_flush_cache_l2(void)
- {
- switch (sc_lsize()) {
- case 64:
- blast_scache64();
- break;
- case 128:
- blast_scache128();
- break;
- default:
- printk(KERN_EMERG "Unknown L2 line sizen");
- while(1);
- }
- }
- void
- andes_flush_icache_page(unsigned long page)
- {
- if (scache_lsz64)
- blast_scache64_page(page);
- else
- blast_scache128_page(page);
- }
- static void
- andes_flush_cache_sigtramp(unsigned long addr)
- {
- protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
- protected_flush_icache_line(addr & ~(ic_lsize - 1));
- }
- #define NTLB_ENTRIES 64
- #define NTLB_ENTRIES_HALF 32
- void local_flush_tlb_all(void)
- {
- unsigned long flags;
- unsigned long old_ctx;
- unsigned long entry;
- #ifdef DEBUG_TLB
- printk("[tlball]");
- #endif
- __save_and_cli(flags);
- /* Save old context and create impossible VPN2 value */
- old_ctx = get_entryhi() & ASID_MASK;
- set_entryhi(CKSEG0);
- set_entrylo0(0);
- set_entrylo1(0);
- entry = get_wired();
- /* Blast 'em all away. */
- while (entry < NTLB_ENTRIES) {
- set_index(entry);
- tlb_write_indexed();
- entry++;
- }
- set_entryhi(old_ctx);
- __restore_flags(flags);
- }
- void local_flush_tlb_mm(struct mm_struct *mm)
- {
- if (CPU_CONTEXT(smp_processor_id(), mm) != 0) {
- unsigned long flags;
- #ifdef DEBUG_TLB
- printk("[tlbmm<%d>]", mm->context);
- #endif
- __save_and_cli(flags);
- get_new_mmu_context(mm, smp_processor_id());
- if(mm == current->mm)
- set_entryhi(CPU_CONTEXT(smp_processor_id(), mm)
- & ASID_MASK);
- __restore_flags(flags);
- }
- }
- void local_flush_tlb_range(struct mm_struct *mm, unsigned long start,
- unsigned long end)
- {
- if (CPU_CONTEXT(smp_processor_id(), mm) != 0) {
- unsigned long flags;
- int size;
- #ifdef DEBUG_TLB
- printk("[tlbrange<%02x,%08lx,%08lx>]",
- (mm->context & ASID_MASK), 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() & ASID_MASK);
- int newpid = (CPU_CONTEXT(smp_processor_id(), mm)
- & ASID_MASK);
- 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);
- tlb_probe();
- idx = get_index();
- set_entrylo0(0);
- set_entrylo1(0);
- set_entryhi(KSEG0);
- if(idx < 0)
- continue;
- tlb_write_indexed();
- }
- set_entryhi(oldpid);
- } else {
- get_new_mmu_context(mm, smp_processor_id());
- if(mm == current->mm)
- set_entryhi(CPU_CONTEXT(smp_processor_id(), mm)
- & ASID_MASK);
- }
- __restore_flags(flags);
- }
- }
- void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
- {
- if (CPU_CONTEXT(smp_processor_id(), vma->vm_mm) != 0) {
- unsigned long flags;
- int oldpid, newpid, idx;
- #ifdef DEBUG_TLB
- printk("[tlbpage<%d,%08lx>]", vma->vm_mm->context, page);
- #endif
- newpid = (CPU_CONTEXT(smp_processor_id(), vma->vm_mm) &
- ASID_MASK);
- page &= (PAGE_MASK << 1);
- __save_and_cli(flags);
- oldpid = (get_entryhi() & ASID_MASK);
- set_entryhi(page | newpid);
- tlb_probe();
- idx = get_index();
- set_entrylo0(0);
- set_entrylo1(0);
- set_entryhi(KSEG0);
- if (idx < 0)
- goto finish;
- tlb_write_indexed();
- finish:
- set_entryhi(oldpid);
- __restore_flags(flags);
- }
- }
- /* XXX Simplify this. On the R10000 writing a TLB entry for an virtual
- address that already exists will overwrite the old entry and not result
- in TLB malfunction or TLB shutdown. */
- static void andes_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() & ASID_MASK;
- if ((pid != (CPU_CONTEXT(smp_processor_id(), vma->vm_mm) & ASID_MASK))
- || (CPU_CONTEXT(smp_processor_id(), vma->vm_mm) == 0)) {
- printk(KERN_WARNING
- "%s: Wheee, bogus tlbpid mmpid=%d tlbpid=%dn",
- __FUNCTION__, (int) (CPU_CONTEXT(smp_processor_id(),
- vma->vm_mm) & ASID_MASK), pid);
- }
- __save_and_cli(flags);
- address &= (PAGE_MASK << 1);
- set_entryhi(address | (pid));
- pgdp = pgd_offset(vma->vm_mm, address);
- tlb_probe();
- pmdp = pmd_offset(pgdp, address);
- idx = get_index();
- ptep = pte_offset(pmdp, address);
- set_entrylo0(pte_val(*ptep++) >> 6);
- set_entrylo1(pte_val(*ptep) >> 6);
- set_entryhi(address | (pid));
- if (idx < 0) {
- tlb_write_random();
- } else {
- tlb_write_indexed();
- }
- set_entryhi(pid);
- __restore_flags(flags);
- }
- void __init ld_mmu_andes(void)
- {
- printk("Primary instruction cache %dkb, linesize %d bytesn",
- icache_size >> 10, ic_lsize);
- printk("Primary data cache %dkb, linesize %d bytesn",
- dcache_size >> 10, dc_lsize);
- printk("Secondary cache sized at %ldK, linesize %ldn",
- scache_size() >> 10, sc_lsize());
- _clear_page = andes_clear_page;
- _copy_page = andes_copy_page;
- _flush_cache_l1 = andes_flush_cache_l1;
- _flush_cache_l2 = andes_flush_cache_l2;
- _flush_cache_sigtramp = andes_flush_cache_sigtramp;
- switch (sc_lsize()) {
- case 64:
- scache_lsz64 = 1;
- break;
- case 128:
- scache_lsz64 = 0;
- break;
- default:
- printk(KERN_EMERG "Unknown L2 line sizen");
- while(1);
- }
- _update_mmu_cache = andes_update_mmu_cache;
- flush_cache_l1();
- /*
- * 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);
- write_32bit_cp0_register(CP0_FRAMEMASK, 0);
- /* From this point on the ARC firmware is dead. */
- local_flush_tlb_all();
- /* Did I tell you that ARC SUCKS? */
- }