c-sb1.c
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上传日期:2013-04-10
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- /*
- * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
- * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org)
- * Copyright (C) 2000, 2001 Broadcom Corporation
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that 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.
- */
- #include <linux/config.h>
- #include <linux/init.h>
- #include <asm/mmu_context.h>
- #include <asm/bootinfo.h>
- #include <asm/cacheops.h>
- #include <asm/cpu.h>
- #include <asm/uaccess.h>
- /* These are probed at ld_mmu time */
- static unsigned int icache_size;
- static unsigned int dcache_size;
- static unsigned int icache_line_size;
- static unsigned int dcache_line_size;
- static unsigned int icache_index_mask;
- static unsigned int icache_assoc;
- static unsigned int dcache_assoc;
- static unsigned int icache_sets;
- static unsigned int dcache_sets;
- 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;
- }
- }
- /*
- * The dcache is fully coherent to the system, with one
- * big caveat: the instruction stream. In other words,
- * if we miss in the icache, and have dirty data in the
- * L1 dcache, then we'll go out to memory (or the L2) and
- * get the not-as-recent data.
- *
- * So the only time we have to flush the dcache is when
- * we're flushing the icache. Since the L2 is fully
- * coherent to everything, including I/O, we never have
- * to flush it
- */
- static void sb1_flush_cache_all(void)
- {
- }
- static void local_sb1___flush_cache_all(void)
- {
- /*
- * Haven't worried too much about speed here; given that we're flushing
- * the icache, the time to invalidate is dwarfed by the time it's going
- * to take to refill it. Register usage:
- *
- * $1 - moving cache index
- * $2 - set count
- */
- __asm__ __volatile__ (
- ".set push n"
- ".set noreorder n"
- ".set noat n"
- ".set mips4 n"
- " move $1, %2 n" /* Start at index 0 */
- "1: cache %3, 0($1) n" /* WB/Invalidate this index */
- " addiu %1, %1, -1 n" /* Decrement loop count */
- " bnez %1, 1b n" /* loop test */
- " addu $1, $1, %0 n" /* Next address */
- ".set pop n"
- :
- : "r" (dcache_line_size), "r" (dcache_sets * dcache_assoc),
- "r" (KSEG0), "i" (Index_Writeback_Inv_D));
- __asm__ __volatile__ (
- ".set push n"
- ".set noreorder n"
- ".set mips2 n"
- "sync n"
- #ifdef CONFIG_SB1_PASS_1_WORKAROUNDS /* Bug 1384 */
- "sync n"
- #endif
- ".set pop n");
- __asm__ __volatile__ (
- ".set push n"
- ".set noreorder n"
- ".set noat n"
- ".set mips4 n"
- " move $1, %2 n" /* Start at index 0 */
- "1: cache %3, 0($1) n" /* Invalidate this index */
- " addiu %1, %1, -1 n" /* Decrement loop count */
- " bnez %1, 1b n" /* loop test */
- " addu $1, $1, %0 n" /* Next address */
- ".set pop n"
- :
- : "r" (icache_line_size), "r" (icache_sets * icache_assoc),
- "r" (KSEG0), "i" (Index_Invalidate_I));
- }
- #ifdef CONFIG_SMP
- extern void sb1___flush_cache_all_ipi(void *ignored);
- asm("sb1___flush_cache_all_ipi = local_sb1___flush_cache_all");
- static void sb1___flush_cache_all(void)
- {
- smp_call_function(sb1___flush_cache_all_ipi, 0, 1, 1);
- local_sb1___flush_cache_all();
- }
- #else
- extern void sb1___flush_cache_all(void);
- asm("sb1___flush_cache_all = local_sb1___flush_cache_all");
- #endif
- /*
- * When flushing a range in the icache, we have to first writeback
- * the dcache for the same range, so new ifetches will see any
- * data that was dirty in the dcache.
- *
- * The start/end arguments are expected to be Kseg addresses.
- */
- static void local_sb1_flush_icache_range(unsigned long start, unsigned long end)
- {
- #ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
- unsigned long flags;
- local_irq_save(flags);
- #endif
- __asm__ __volatile__ (
- ".set push n"
- ".set noreorder n"
- ".set noat n"
- ".set mips4 n"
- " move $1, %0 n"
- "1: n"
- #ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
- ".align 3 n"
- " lw $0, 0($1) n" /* Bug 1370, 1368 */
- " sync n"
- #endif
- " cache %3, 0($1) n" /* Hit-WB{,-inval} this address */
- " bne $1, %1, 1b n" /* loop test */
- " addu $1, $1, %2 n" /* next line */
- ".set pop n"
- :
- : "r" (start & ~(dcache_line_size - 1)),
- "r" ((end - 1) & ~(dcache_line_size - 1)),
- "r" (dcache_line_size),
- #ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
- "i" (Hit_Writeback_Inv_D)
- #else
- "i" (Hit_Writeback_D)
- #endif
- );
- __asm__ __volatile__ (
- ".set push n"
- ".set noreorder n"
- ".set mips2 n"
- "sync n"
- #ifdef CONFIG_SB1_PASS_1_WORKAROUNDS /* Bug 1384 */
- "sync n"
- #endif
- ".set pop n");
- #ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
- local_irq_restore(flags);
- #endif
- __asm__ __volatile__ (
- ".set push n"
- ".set noreorder n"
- ".set noat n"
- ".set mips4 n"
- " move $1, %0 n"
- ".align 3 n"
- "1: cache %3, (0<<13)($1) n" /* Index-inval this address */
- " cache %3, (1<<13)($1) n" /* Index-inval this address */
- " cache %3, (2<<13)($1) n" /* Index-inval this address */
- " cache %3, (3<<13)($1) n" /* Index-inval this address */
- " bne $1, %1, 1b n" /* loop test */
- " addu $1, $1, %2 n" /* next line */
- ".set pop n"
- :
- : "r" (start & ~(icache_line_size - 1)),
- "r" ((end - 1) & ~(icache_line_size - 1)),
- "r" (icache_line_size),
- "i" (Index_Invalidate_I));
- }
- #ifdef CONFIG_SMP
- struct flush_icache_range_args {
- unsigned long start;
- unsigned long end;
- };
- static void sb1_flush_icache_range_ipi(void *info)
- {
- struct flush_icache_range_args *args = info;
- local_sb1_flush_icache_range(args->start, args->end);
- }
- void sb1_flush_icache_range(unsigned long start, unsigned long end)
- {
- struct flush_icache_range_args args;
- args.start = start;
- args.end = end;
- smp_call_function(sb1_flush_icache_range_ipi, &args, 1, 1);
- local_sb1_flush_icache_range(start, end);
- }
- #else
- void sb1_flush_icache_range(unsigned long start, unsigned long end);
- asm("sb1_flush_icache_range = local_sb1_flush_icache_range");
- #endif
- /*
- * If there's no context yet, or the page isn't executable, no icache flush
- * is needed
- */
- static void sb1_flush_icache_page(struct vm_area_struct *vma,
- struct page *page)
- {
- if (!(vma->vm_flags & VM_EXEC))
- return;
- /*
- * We're not sure of the virtual address(es) involved here, so
- * conservatively flush the entire caches on all processors
- * (ouch).
- */
- sb1___flush_cache_all();
- }
- static inline void protected_flush_icache_line(unsigned long addr)
- {
- __asm__ __volatile__(
- " .set push n"
- " .set noreorder n"
- " .set mips4 n"
- "1: cache %1, (%0) n"
- "2: .set pop n"
- " .section __ex_table,"a"n"
- " .word 1b, 2b n"
- " .previous"
- :
- : "r" (addr),
- "i" (Hit_Invalidate_I));
- }
- static inline void protected_writeback_dcache_line(unsigned long addr)
- {
- #ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
- /* Have to be sure the TLB entry exists for the cache op,
- so we have to be sure that nothing happens in between the
- lw and the cache op
- */
- unsigned long flags;
- local_irq_save(flags);
- #endif
- __asm__ __volatile__(
- " .set push n"
- " .set noreorder n"
- " .set mips4 n"
- "1: n"
- #ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
- " lw $0, (%0) n"
- " sync n"
- #endif
- " cache %1, 0(%0) n" /* Hit-WB{-inval} this address */
- /* XXX: should be able to do this after both dcache cache
- ops, but there's no guarantee that this will be inlined,
- and the pass1 restriction checker can't detect syncs
- following cache ops except in the following basic block.
- */
- " sync n"
- #ifdef CONFIG_SB1_PASS_1_WORKAROUNDS /* Bug 1384 */
- " sync n"
- #endif
- "2: .set pop n"
- " .section __ex_table,"a"n"
- " .word 1b, 2b n"
- " .previous"
- :
- : "r" (addr),
- #ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
- "i" (Hit_Writeback_Inv_D)
- #else
- "i" (Hit_Writeback_D)
- #endif
- );
- #ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
- local_irq_restore(flags);
- #endif
- }
- /*
- * A signal trampoline must fit into a single cacheline.
- */
- static void local_sb1_flush_cache_sigtramp(unsigned long addr)
- {
- unsigned long daddr, iaddr;
- daddr = addr & ~(dcache_line_size - 1);
- protected_writeback_dcache_line(daddr);
- iaddr = addr & ~(icache_line_size - 1);
- protected_flush_icache_line(iaddr);
- }
- #ifdef CONFIG_SMP
- static void sb1_flush_cache_sigtramp_ipi(void *info)
- {
- unsigned long iaddr = (unsigned long) info;
- iaddr = iaddr & ~(icache_line_size - 1);
- protected_flush_icache_line(iaddr);
- }
- static void sb1_flush_cache_sigtramp(unsigned long addr)
- {
- unsigned long tmp;
- /*
- * Flush the local dcache, then load the instruction back into a
- * register. That will make sure that any remote CPU also has
- * written back it's data cache to memory.
- */
- local_sb1_flush_cache_sigtramp(addr);
- __get_user(tmp, (unsigned long *)addr);
- smp_call_function(sb1_flush_cache_sigtramp_ipi, (void *) addr, 1, 1);
- }
- #else
- void sb1_flush_cache_sigtramp(unsigned long addr);
- asm("sb1_flush_cache_sigtramp = local_sb1_flush_cache_sigtramp");
- #endif
- static void sb1_flush_icache_all(void)
- {
- /*
- * Haven't worried too much about speed here; given that we're flushing
- * the icache, the time to invalidate is dwarfed by the time it's going
- * to take to refill it. Register usage:
- *
- * $1 - moving cache index
- * $2 - set count
- */
- __asm__ __volatile__ (
- ".set push n"
- ".set noreorder n"
- ".set noat n"
- ".set mips4 n"
- " move $1, %2 n" /* Start at index 0 */
- "1: cache %3, 0($1) n" /* Invalidate this index */
- " addiu %1, %1, -1 n" /* Decrement loop count */
- " bnez %1, 1b n" /* loop test */
- " addu $1, $1, %0 n" /* Next address */
- ".set pop n"
- :
- : "r" (icache_line_size), "r" (icache_sets * icache_assoc),
- "r" (KSEG0), "i" (Index_Invalidate_I));
- }
- /*
- * Anything that just flushes dcache state can be ignored, as we're always
- * coherent in dcache space. This is just a dummy function that all the
- * nop'ed routines point to
- */
- static void sb1_nop(void)
- {
- }
- /*
- * This only needs to make sure stores done up to this
- * point are visible to other agents outside the CPU. Given
- * the coherent nature of the ZBbus, all that's required here is
- * a sync to make sure the data gets out to the caches and is
- * visible to an arbitrary A Phase from an external agent
- *
- * Actually, I'm not even sure that's necessary; the semantics
- * of this function aren't clear. If it's supposed to serve as
- * a memory barrier, this is needed. If it's only meant to
- * prevent data from being invisible to non-cpu memory accessors
- * for some indefinite period of time (e.g. in a non-coherent
- * dcache) then this function would be a complete nop.
- */
- static void sb1_flush_page_to_ram(struct page *page)
- {
- __asm__ __volatile__(
- " sync n" /* Short pipe */
- :::"memory");
- }
- /*
- * Cache set values (from the mips64 spec)
- * 0 - 64
- * 1 - 128
- * 2 - 256
- * 3 - 512
- * 4 - 1024
- * 5 - 2048
- * 6 - 4096
- * 7 - Reserved
- */
- static unsigned int decode_cache_sets(unsigned int config_field)
- {
- if (config_field == 7) {
- /* JDCXXX - Find a graceful way to abort. */
- return 0;
- }
- return (1<<(config_field + 6));
- }
- /*
- * Cache line size values (from the mips64 spec)
- * 0 - No cache present.
- * 1 - 4 bytes
- * 2 - 8 bytes
- * 3 - 16 bytes
- * 4 - 32 bytes
- * 5 - 64 bytes
- * 6 - 128 bytes
- * 7 - Reserved
- */
- static unsigned int decode_cache_line_size(unsigned int config_field)
- {
- if (config_field == 0) {
- return 0;
- } else if (config_field == 7) {
- /* JDCXXX - Find a graceful way to abort. */
- return 0;
- }
- return (1<<(config_field + 1));
- }
- /*
- * Relevant bits of the config1 register format (from the MIPS32/MIPS64 specs)
- *
- * 24:22 Icache sets per way
- * 21:19 Icache line size
- * 18:16 Icache Associativity
- * 15:13 Dcache sets per way
- * 12:10 Dcache line size
- * 9:7 Dcache Associativity
- */
- static __init void probe_cache_sizes(void)
- {
- u32 config1;
- config1 = read_mips32_cp0_config1();
- icache_line_size = decode_cache_line_size((config1 >> 19) & 0x7);
- dcache_line_size = decode_cache_line_size((config1 >> 10) & 0x7);
- icache_sets = decode_cache_sets((config1 >> 22) & 0x7);
- dcache_sets = decode_cache_sets((config1 >> 13) & 0x7);
- icache_assoc = ((config1 >> 16) & 0x7) + 1;
- dcache_assoc = ((config1 >> 7) & 0x7) + 1;
- icache_size = icache_line_size * icache_sets * icache_assoc;
- dcache_size = dcache_line_size * dcache_sets * dcache_assoc;
- icache_index_mask = (icache_sets - 1) * icache_line_size;
- }
- /*
- * This is called from loadmmu.c. We have to set up all the
- * memory management function pointers, as well as initialize
- * the caches and tlbs
- */
- void ld_mmu_sb1(void)
- {
- probe_cache_sizes();
- _clear_page = sb1_clear_page;
- _copy_page = sb1_copy_page;
- _flush_cache_all = sb1_flush_cache_all;
- ___flush_cache_all = sb1___flush_cache_all;
- _flush_cache_mm = (void (*)(struct mm_struct *))sb1_nop;
- _flush_cache_range = (void *) sb1_nop;
- _flush_page_to_ram = sb1_flush_page_to_ram;
- _flush_icache_page = sb1_flush_icache_page;
- _flush_icache_range = sb1_flush_icache_range;
- /* None of these are needed for the sb1 */
- _flush_cache_page = (void *) sb1_nop;
- _flush_cache_sigtramp = sb1_flush_cache_sigtramp;
- _flush_icache_all = sb1_flush_icache_all;
- change_cp0_config(CONF_CM_CMASK, CONF_CM_DEFAULT);
- flush_cache_all();
- }