sh: SH-4A Privileged Space Mapping Buffer (PMB) support.
Add support for 32-bit physical addressing through the SH-4A Privileged Space Mapping Buffer (PMB). Signed-off-by: Paul Mundt <lethal@linux-sh.org>hifive-unleashed-5.1
Paul Mundt
parent
a09749dd86
commit
0c7b1df69c
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@ -22,4 +22,5 @@ obj-$(CONFIG_CPU_SH4) += tlb-sh4.o ioremap.o
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obj-$(CONFIG_SH7705_CACHE_32KB) += pg-sh7705.o
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endif
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obj-$(CONFIG_SH7705_CACHE_32KB) += cache-sh7705.o
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obj-$(CONFIG_SH7705_CACHE_32KB) += cache-sh7705.o
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obj-$(CONFIG_32BIT) += pmb.o
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@ -0,0 +1,269 @@
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/*
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* arch/sh/mm/pmb.c
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*
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* Privileged Space Mapping Buffer (PMB) Support.
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*
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* Copyright (C) 2005 Paul Mundt
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*
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* P1/P2 Section mapping definitions from map32.h, which was:
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*
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* Copyright 2003 (c) Lineo Solutions,Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include <linux/debugfs.h>
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#include <linux/fs.h>
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#include <linux/seq_file.h>
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#include <linux/err.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/mmu.h>
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#include <asm/io.h>
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#define NR_PMB_ENTRIES 16
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static kmem_cache_t *pmb_cache;
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static unsigned long pmb_map;
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static struct pmb_entry pmb_init_map[] = {
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/* vpn ppn flags (ub/sz/c/wt) */
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/* P1 Section Mappings */
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{ 0x80000000, 0x00000000, PMB_SZ_64M | PMB_C, },
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{ 0x84000000, 0x04000000, PMB_SZ_64M | PMB_C, },
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{ 0x88000000, 0x08000000, PMB_SZ_128M | PMB_C, },
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{ 0x90000000, 0x10000000, PMB_SZ_64M | PMB_C, },
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{ 0x94000000, 0x14000000, PMB_SZ_64M | PMB_C, },
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{ 0x98000000, 0x18000000, PMB_SZ_64M | PMB_C, },
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/* P2 Section Mappings */
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{ 0xa0000000, 0x00000000, PMB_UB | PMB_SZ_64M | PMB_WT, },
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{ 0xa4000000, 0x04000000, PMB_UB | PMB_SZ_64M | PMB_WT, },
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{ 0xa8000000, 0x08000000, PMB_UB | PMB_SZ_128M | PMB_WT, },
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{ 0xb0000000, 0x10000000, PMB_UB | PMB_SZ_64M | PMB_WT, },
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{ 0xb4000000, 0x14000000, PMB_UB | PMB_SZ_64M | PMB_WT, },
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{ 0xb8000000, 0x18000000, PMB_UB | PMB_SZ_64M | PMB_WT, },
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};
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static inline unsigned long mk_pmb_entry(unsigned int entry)
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{
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return (entry & PMB_E_MASK) << PMB_E_SHIFT;
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}
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static inline unsigned long mk_pmb_addr(unsigned int entry)
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{
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return mk_pmb_entry(entry) | PMB_ADDR;
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}
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static inline unsigned long mk_pmb_data(unsigned int entry)
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{
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return mk_pmb_entry(entry) | PMB_DATA;
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}
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struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
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unsigned long flags)
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{
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struct pmb_entry *pmbe;
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pmbe = kmem_cache_alloc(pmb_cache, GFP_KERNEL);
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if (!pmbe)
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return ERR_PTR(-ENOMEM);
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pmbe->vpn = vpn;
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pmbe->ppn = ppn;
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pmbe->flags = flags;
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return pmbe;
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}
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void pmb_free(struct pmb_entry *pmbe)
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{
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kmem_cache_free(pmb_cache, pmbe);
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}
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/*
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* Must be in P2 for __set_pmb_entry()
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*/
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int __set_pmb_entry(unsigned long vpn, unsigned long ppn,
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unsigned long flags, int *entry)
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{
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unsigned int pos = *entry;
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if (unlikely(pos == PMB_NO_ENTRY))
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pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
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repeat:
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if (unlikely(pos > NR_PMB_ENTRIES))
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return -ENOSPC;
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if (test_and_set_bit(pos, &pmb_map)) {
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pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
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goto repeat;
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}
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ctrl_outl(vpn | PMB_V, mk_pmb_addr(pos));
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#ifdef CONFIG_SH_WRITETHROUGH
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/*
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* When we are in 32-bit address extended mode, CCR.CB becomes
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* invalid, so care must be taken to manually adjust cacheable
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* translations.
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*/
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if (likely(flags & PMB_C))
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flags |= PMB_WT;
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#endif
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ctrl_outl(ppn | flags | PMB_V, mk_pmb_data(pos));
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*entry = pos;
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return 0;
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}
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void set_pmb_entry(struct pmb_entry *pmbe)
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{
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jump_to_P2();
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__set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &pmbe->entry);
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back_to_P1();
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}
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void clear_pmb_entry(struct pmb_entry *pmbe)
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{
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unsigned int entry = pmbe->entry;
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unsigned long addr;
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/*
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* Don't allow clearing of wired init entries, P1 or P2 access
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* without a corresponding mapping in the PMB will lead to reset
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* by the TLB.
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*/
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if (unlikely(entry < ARRAY_SIZE(pmb_init_map) ||
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entry >= NR_PMB_ENTRIES))
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return;
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jump_to_P2();
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/* Clear V-bit */
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addr = mk_pmb_addr(entry);
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ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);
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addr = mk_pmb_data(entry);
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ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);
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back_to_P1();
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clear_bit(entry, &pmb_map);
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}
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static void pmb_cache_ctor(void *pmb, kmem_cache_t *cachep, unsigned long flags)
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{
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memset(pmb, 0, sizeof(struct pmb_entry));
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((struct pmb_entry *)pmb)->entry = PMB_NO_ENTRY;
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}
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static int __init pmb_init(void)
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{
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unsigned int nr_entries = ARRAY_SIZE(pmb_init_map);
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unsigned int entry;
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BUG_ON(unlikely(nr_entries >= NR_PMB_ENTRIES));
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pmb_cache = kmem_cache_create("pmb", sizeof(struct pmb_entry),
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0, 0, pmb_cache_ctor, NULL);
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BUG_ON(!pmb_cache);
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jump_to_P2();
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/*
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* Ordering is important, P2 must be mapped in the PMB before we
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* can set PMB.SE, and P1 must be mapped before we jump back to
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* P1 space.
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*/
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for (entry = 0; entry < nr_entries; entry++) {
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struct pmb_entry *pmbe = pmb_init_map + entry;
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__set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &entry);
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}
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ctrl_outl(0, PMB_IRMCR);
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/* PMB.SE and UB[7] */
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ctrl_outl((1 << 31) | (1 << 7), PMB_PASCR);
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back_to_P1();
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return 0;
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}
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arch_initcall(pmb_init);
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#ifdef CONFIG_DEBUG_FS
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static int pmb_seq_show(struct seq_file *file, void *iter)
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{
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int i;
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seq_printf(file, "V: Valid, C: Cacheable, WT: Write-Through\n"
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"CB: Copy-Back, B: Buffered, UB: Unbuffered\n");
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seq_printf(file, "ety vpn ppn size flags\n");
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for (i = 0; i < NR_PMB_ENTRIES; i++) {
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unsigned long addr, data;
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unsigned int size;
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char *sz_str = NULL;
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addr = ctrl_inl(mk_pmb_addr(i));
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data = ctrl_inl(mk_pmb_data(i));
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size = data & PMB_SZ_MASK;
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sz_str = (size == PMB_SZ_16M) ? " 16MB":
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(size == PMB_SZ_64M) ? " 64MB":
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(size == PMB_SZ_128M) ? "128MB":
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"512MB";
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/* 02: V 0x88 0x08 128MB C CB B */
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seq_printf(file, "%02d: %c 0x%02lx 0x%02lx %s %c %s %s\n",
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i, ((addr & PMB_V) && (data & PMB_V)) ? 'V' : ' ',
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(addr >> 24) & 0xff, (data >> 24) & 0xff,
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sz_str, (data & PMB_C) ? 'C' : ' ',
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(data & PMB_WT) ? "WT" : "CB",
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(data & PMB_UB) ? "UB" : " B");
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}
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return 0;
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}
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static int pmb_debugfs_open(struct inode *inode, struct file *file)
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{
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return single_open(file, pmb_seq_show, NULL);
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}
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static struct file_operations pmb_debugfs_fops = {
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.owner = THIS_MODULE,
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.open = pmb_debugfs_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static int __init pmb_debugfs_init(void)
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{
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struct dentry *dentry;
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dentry = debugfs_create_file("pmb", S_IFREG | S_IRUGO,
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NULL, NULL, &pmb_debugfs_fops);
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if (IS_ERR(dentry))
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return PTR_ERR(dentry);
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return 0;
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}
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postcore_initcall(pmb_debugfs_init);
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#endif
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@ -25,5 +25,51 @@ typedef struct {
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typedef unsigned long mm_context_t;
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#endif /* CONFIG_MMU */
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#endif /* __MMH_H */
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/*
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* Privileged Space Mapping Buffer (PMB) definitions
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*/
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#define PMB_PASCR 0xff000070
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#define PMB_IRMCR 0xff000078
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#define PMB_ADDR 0xf6100000
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#define PMB_DATA 0xf7100000
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#define PMB_ENTRY_MAX 16
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#define PMB_E_MASK 0x0000000f
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#define PMB_E_SHIFT 8
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#define PMB_SZ_16M 0x00000000
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#define PMB_SZ_64M 0x00000010
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#define PMB_SZ_128M 0x00000080
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#define PMB_SZ_512M 0x00000090
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#define PMB_SZ_MASK PMB_SZ_512M
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#define PMB_C 0x00000008
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#define PMB_WT 0x00000001
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#define PMB_UB 0x00000200
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#define PMB_V 0x00000100
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#define PMB_NO_ENTRY (-1)
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struct pmb_entry {
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unsigned long vpn;
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unsigned long ppn;
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unsigned long flags;
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/*
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* 0 .. NR_PMB_ENTRIES for specific entry selection, or
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* PMB_NO_ENTRY to search for a free one
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*/
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int entry;
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};
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/* arch/sh/mm/pmb.c */
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int __set_pmb_entry(unsigned long vpn, unsigned long ppn,
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unsigned long flags, int *entry);
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void set_pmb_entry(struct pmb_entry *pmbe);
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void clear_pmb_entry(struct pmb_entry *pmbe);
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struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
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unsigned long flags);
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void pmb_free(struct pmb_entry *pmbe);
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#endif /* __MMU_H */
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