| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 8 Apr 2009 15:30:54 +0800
From: liqin.chen@...plusct.com
To: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: torvalds@...ux-foundation.org, Arnd Bergmann <arnd@...db.de>,
Sam Ravnborg <sam@...nborg.org>,
Thomas Gleixner <tglx@...utronix.de>,
Kyle McMartin <kyle@...artin.ca>
Subject: [PATCH 13/14] score - New architecure port to SunplusCT S+CORE
From: Chen Liqin <liqin.chen@...plusct.com>
mm/cache.c, mm/dma-default.c, mm/extable.c, mm/fault.c,
mm/init.c, mm/ioremap.c, mm/Makefile, mm/pgtable.c,
mm/tlb-miss.S and mm/tlb-score.c for the score architecture.
Signed off by: Chen Liqin <liqin.chen@...plusct.com>
Signed off by: Lennox Wu <lennox.wu@...plusct.com>
--
diff -uprN -x linux-2.6-git.ori/Documentation/dontdiff
linux-2.6-git.ori/arch/score/mm/cache.c
linux-2.6-git.new/arch/score/mm/cache.c
--- linux-2.6-git.ori/arch/score/mm/cache.c 1970-01-01
08:00:00.000000000 +0800
+++ linux-2.6-git.new/arch/score/mm/cache.c 2009-04-08
10:27:56.000000000 +0800
@@ -0,0 +1,307 @@
+/*
+ * arch/score/mm/cache.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Lennox Wu <lennox.wu@...plusct.com>
+ * Chen Liqin <liqin.chen@...plusct.com>
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/linkage.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <asm/cache.h>
+#include <asm/cacheflush.h>
+#include <asm/mmu_context.h>
+
+/* Cache operations. */
+void (*flush_cache_all)(void);
+void (*__flush_cache_all)(void);
+void (*flush_cache_mm)(struct mm_struct *mm);
+void (*flush_cache_range)(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end);
+void (*flush_cache_page)(struct vm_area_struct *vma,
+ unsigned long page, unsigned long pfn);
+void (*flush_icache_range)(unsigned long start, unsigned long end);
+void (*__flush_cache_vmap)(void);
+void (*__flush_cache_vunmap)(void);
+void (*flush_cache_sigtramp)(unsigned long addr);
+void (*flush_data_cache_page)(unsigned long addr);
+EXPORT_SYMBOL(flush_data_cache_page);
+void (*flush_icache_all)(void);
+
+/*Score 7 cache operations*/
+static inline void s7___flush_cache_all(void);
+static void s7_flush_cache_mm(struct mm_struct *mm);
+static void s7_flush_cache_range(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end);
+static void s7_flush_cache_page(struct vm_area_struct *vma,
+ unsigned long page, unsigned long pfn);
+static void s7_flush_icache_range(unsigned long start, unsigned long
end);
+static void s7_flush_cache_sigtramp(unsigned long addr);
+static void s7_flush_data_cache_page(unsigned long addr);
+static void s7_flush_dcache_range(unsigned long start, unsigned long
end);
+
+void __update_cache(struct vm_area_struct *vma, unsigned long address,
+ pte_t pte)
+{
+ struct page *page;
+ unsigned long pfn, addr;
+ int exec = (vma->vm_flags & VM_EXEC);
+
+ pfn = pte_pfn(pte);
+ if (unlikely(!pfn_valid(pfn)))
+ return;
+ page = pfn_to_page(pfn);
+ if (page_mapping(page) && Page_dcache_dirty(page)) {
+ addr = (unsigned long) page_address(page);
+ if (exec)
+ s7_flush_data_cache_page(addr);
+ ClearPageDcacheDirty(page);
+ }
+}
+
+static inline void setup_protection_map(void)
+{
+ protection_map[0] = PAGE_NONE;
+ protection_map[1] = PAGE_READONLY;
+ protection_map[2] = PAGE_COPY;
+ protection_map[3] = PAGE_COPY;
+ protection_map[4] = PAGE_READONLY;
+ protection_map[5] = PAGE_READONLY;
+ protection_map[6] = PAGE_COPY;
+ protection_map[7] = PAGE_COPY;
+ protection_map[8] = PAGE_NONE;
+ protection_map[9] = PAGE_READONLY;
+ protection_map[10] = PAGE_SHARED;
+ protection_map[11] = PAGE_SHARED;
+ protection_map[12] = PAGE_READONLY;
+ protection_map[13] = PAGE_READONLY;
+ protection_map[14] = PAGE_SHARED;
+ protection_map[15] = PAGE_SHARED;
+}
+
+void __devinit cpu_cache_init(void)
+{
+ flush_cache_all = s7_flush_cache_all;
+ __flush_cache_all = s7___flush_cache_all;
+ flush_cache_mm = s7_flush_cache_mm;
+ flush_cache_range = s7_flush_cache_range;
+ flush_cache_page = s7_flush_cache_page;
+ flush_icache_range = s7_flush_icache_range;
+ flush_cache_sigtramp = s7_flush_cache_sigtramp;
+ flush_data_cache_page = s7_flush_data_cache_page;
+
+ setup_protection_map();
+}
+
+void s7_flush_icache_all(void)
+{
+ __asm__ __volatile__(
+ "la r8, s7_flush_icache_all\n"
+ "cache 0x10, [r8, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\nnop\n"
+ : : : "r8");
+}
+
+void s7_flush_dcache_all(void)
+{
+ __asm__ __volatile__(
+ "la r8, s7_flush_dcache_all\n"
+ "cache 0x1f, [r8, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\nnop\n"
+ "cache 0x1a, [r8, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\nnop\n"
+ : : : "r8");
+}
+
+void s7_flush_cache_all(void)
+{
+ __asm__ __volatile__(
+ "la r8, s7_flush_cache_all\n"
+ "cache 0x10, [r8, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\nnop\n"
+ "cache 0x1f, [r8, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\nnop\n"
+ "cache 0x1a, [r8, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\nnop\n"
+ : : : "r8");
+}
+
+void s7___flush_cache_all(void)
+{
+ __asm__ __volatile__(
+ "la r8, s7_flush_cache_all\n"
+ "cache 0x10, [r8, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\nnop\n"
+ "cache 0x1f, [r8, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\nnop\n"
+ "cache 0x1a, [r8, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\nnop\n"
+ : : : "r8");
+}
+
+static void s7_flush_cache_mm(struct mm_struct *mm)
+{
+ if (!cpu_context(0, mm))
+ return;
+ s7_flush_cache_all();
+}
+
+/*if we flush a range precisely , the processing may be very long.
+We must check each page in the range whether present. If the page is
present,
+we can flush the range in the page. Be careful, the range may be cross
two
+page, a page is present and another is not present.
+*/
+/*
+The interface is provided in hopes that the port can find
+a suitably efficient method for removing multiple page
+sized regions from the cache.
+*/
+static void s7_flush_cache_range(struct vm_area_struct *vma, unsigned
long start,
+ unsigned long end)
+{
+ struct mm_struct *mm = vma->vm_mm;
+ int exec = vma->vm_flags & VM_EXEC;
+ pgd_t *pgdp;
+ pud_t *pudp;
+ pmd_t *pmdp;
+ pte_t *ptep;
+
+ if (!cpu_context(0, mm))
+ return;
+
+ pgdp = pgd_offset(mm, start);
+ pudp = pud_offset(pgdp, start);
+ pmdp = pmd_offset(pudp, start);
+ ptep = pte_offset(pmdp, start);
+
+ while (start <= end) {
+ unsigned long tmpend;
+ pgdp = pgd_offset(mm, start);
+ pudp = pud_offset(pgdp, start);
+ pmdp = pmd_offset(pudp, start);
+ ptep = pte_offset(pmdp, start);
+
+ if (!(pte_val(*ptep) & _PAGE_PRESENT)) {
+ start = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
+ continue;
+ }
+ tmpend = (start | (PAGE_SIZE-1)) > end ?
+ end : (start | (PAGE_SIZE-1));
+
+ s7_flush_dcache_range(start, tmpend);
+ if (exec)
+ s7_flush_icache_range(start, tmpend);
+ start = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
+ }
+}
+
+static void s7_flush_cache_page(struct vm_area_struct *vma, unsigned long
addr,
+ unsigned long pfn)
+{
+ int exec = vma->vm_flags & VM_EXEC;
+ unsigned long kaddr = 0xa0000000 | (pfn << PAGE_SHIFT);
+
+ s7_flush_dcache_range(kaddr, kaddr + PAGE_SIZE);
+
+ if (exec)
+ s7_flush_icache_range(kaddr, kaddr + PAGE_SIZE);
+}
+
+static void s7_flush_cache_sigtramp(unsigned long addr)
+{
+ __asm__ __volatile__(
+ "cache 0x02, [%0, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\n"
+ "cache 0x02, [%0, 0x4]\n"
+ "nop\nnop\nnop\nnop\nnop\n"
+
+ "cache 0x0d, [%0, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\n"
+ "cache 0x0d, [%0, 0x4]\n"
+ "nop\nnop\nnop\nnop\nnop\n"
+
+ "cache 0x1a, [%0, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\n"
+ : : "r" (addr));
+}
+
+/*
+Just flush entire Dcache!!
+You must ensure the page doesn't include instructions, because
+the function will not flush the Icache.
+The addr must be cache aligned.
+*/
+static void s7_flush_data_cache_page(unsigned long addr)
+{
+ unsigned int i;
+ for (i = 0; i < PAGE_SIZE / DCACHE_LSIZE; i += DCACHE_LSIZE) {
+ __asm__ __volatile__(
+ "cache 0x0e, [%0, 0]\n"
+ "cache 0x1a, [%0, 0]\n"
+ "nop\n"
+ : : "r" (addr));
+ addr += DCACHE_LSIZE;
+ }
+}
+
+/*
+1. WB and invalid a cache line of Dcache
+2. Drain Write Buffer
+the range must be smaller than PAGE_SIZE
+*/
+static void s7_flush_dcache_range(unsigned long start, unsigned long end)
+{
+ int size, i;
+
+ start = start & ~(ICACHE_LSIZE - 1);
+ end = end & ~(ICACHE_LSIZE - 1);
+ size = end - start;
+ /* flush dcache to ram, and invalidate dcache lines. */
+ for (i = 0; i < size; i += DCACHE_LSIZE) {
+ __asm__ __volatile__(
+ "cache 0x0e, [%0, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\n"
+ "cache 0x1a, [%0, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\n"
+ : : "r" (start));
+ start += DCACHE_LSIZE;
+ }
+}
+
+static void s7_flush_icache_range(unsigned long start, unsigned long end)
+{
+ int size, i;
+ start = start & ~(ICACHE_LSIZE - 1);
+ end = end & ~(ICACHE_LSIZE - 1);
+
+ size = end - start;
+ /* invalidate icache lines. */
+ for (i = 0; i < size; i += ICACHE_LSIZE) {
+ __asm__ __volatile__(
+ "cache 0x02, [%0, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\n"
+ : : "r" (start));
+ start += ICACHE_LSIZE;
+ }
+}
diff -uprN -x linux-2.6-git.ori/Documentation/dontdiff
linux-2.6-git.ori/arch/score/mm/dma-default.c
linux-2.6-git.new/arch/score/mm/dma-default.c
--- linux-2.6-git.ori/arch/score/mm/dma-default.c 1970-01-01
08:00:00.000000000 +0800
+++ linux-2.6-git.new/arch/score/mm/dma-default.c 2009-04-07
21:32:51.000000000 +0800
@@ -0,0 +1,158 @@
+/*
+ * arch/score/mm/dma-default.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Lennox Wu <lennox.wu@...plusct.com>
+ * Chen Liqin <liqin.chen@...plusct.com>
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/types.h>
+#include <linux/dma-mapping.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/scatterlist.h>
+#include <linux/string.h>
+#include <asm/cache.h>
+#include <asm/io.h>
+
+void *dma_alloc_noncoherent(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp)
+{
+ return 0;
+}
+EXPORT_SYMBOL(dma_alloc_noncoherent);
+
+void *dma_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp)
+{
+ return 0;
+}
+EXPORT_SYMBOL(dma_alloc_coherent);
+
+void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_handle)
+{
+}
+EXPORT_SYMBOL(dma_free_noncoherent);
+
+void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_handle)
+{
+}
+EXPORT_SYMBOL(dma_free_coherent);
+
+dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
+ enum dma_data_direction direction)
+{
+ return 0;
+}
+EXPORT_SYMBOL(dma_map_single);
+
+void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t
size,
+ enum dma_data_direction direction)
+{
+}
+EXPORT_SYMBOL(dma_unmap_single);
+
+int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+ enum dma_data_direction direction)
+{
+ return 0;
+}
+EXPORT_SYMBOL(dma_map_sg);
+
+dma_addr_t dma_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size, enum dma_data_direction
direction)
+{
+ return 0;
+}
+EXPORT_SYMBOL(dma_map_page);
+
+void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t
size,
+ enum dma_data_direction direction)
+{
+}
+EXPORT_SYMBOL(dma_unmap_page);
+
+void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int
nhwentries,
+ enum dma_data_direction direction)
+{
+}
+EXPORT_SYMBOL(dma_unmap_sg);
+
+void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
+ size_t size, enum dma_data_direction direction)
+{
+}
+EXPORT_SYMBOL(dma_sync_single_for_cpu);
+
+void dma_sync_single_for_device(struct device *dev, dma_addr_t
dma_handle,
+ size_t size, enum dma_data_direction direction)
+{
+}
+EXPORT_SYMBOL(dma_sync_single_for_device);
+
+void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t
dma_handle,
+ unsigned long offset, size_t size, enum dma_data_direction
direction)
+{
+}
+EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
+
+void dma_sync_single_range_for_device(struct device *dev, dma_addr_t
dma_handle,
+ unsigned long offset, size_t size, enum dma_data_direction
direction)
+{
+}
+EXPORT_SYMBOL(dma_sync_single_range_for_device);
+
+void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int
nelems,
+ enum dma_data_direction direction)
+{
+}
+EXPORT_SYMBOL(dma_sync_sg_for_cpu);
+
+void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
int nelems,
+ enum dma_data_direction direction)
+{
+}
+EXPORT_SYMBOL(dma_sync_sg_for_device);
+
+int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+ return 0;
+}
+EXPORT_SYMBOL(dma_mapping_error);
+
+int dma_supported(struct device *dev, u64 mask)
+{
+ return 0;
+}
+EXPORT_SYMBOL(dma_supported);
+
+int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
+{
+ return 0;
+}
+EXPORT_SYMBOL(dma_is_consistent);
+
+void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+ enum dma_data_direction direction)
+{
+}
+EXPORT_SYMBOL(dma_cache_sync);
diff -uprN -x linux-2.6-git.ori/Documentation/dontdiff
linux-2.6-git.ori/arch/score/mm/extable.c
linux-2.6-git.new/arch/score/mm/extable.c
--- linux-2.6-git.ori/arch/score/mm/extable.c 1970-01-01
08:00:00.000000000 +0800
+++ linux-2.6-git.new/arch/score/mm/extable.c 2009-03-23
14:27:37.000000000 +0800
@@ -0,0 +1,41 @@
+/*
+ * arch/score/mm/extable.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Lennox Wu <lennox.wu@...plusct.com>
+ * Chen Liqin <liqin.chen@...plusct.com>
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <asm/uaccess.h>
+#include <asm/ptrace.h>
+
+int fixup_exception(struct pt_regs *regs)
+{
+ const struct exception_table_entry *fixup;
+
+ fixup = search_exception_tables(regs->cp0_epc);
+ if (fixup) {
+ regs->cp0_epc = fixup->nextinsn;
+ return 1;
+ }
+ return 0;
+}
diff -uprN -x linux-2.6-git.ori/Documentation/dontdiff
linux-2.6-git.ori/arch/score/mm/fault.c
linux-2.6-git.new/arch/score/mm/fault.c
--- linux-2.6-git.ori/arch/score/mm/fault.c 1970-01-01
08:00:00.000000000 +0800
+++ linux-2.6-git.new/arch/score/mm/fault.c 2009-03-31
18:12:32.000000000 +0800
@@ -0,0 +1,240 @@
+/*
+ * arch/score/mm/fault.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Lennox Wu <lennox.wu@...plusct.com>
+ * Chen Liqin <liqin.chen@...plusct.com>
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/vt_kern.h> /* For unblank_screen() */
+#include <linux/module.h>
+#include <asm/mmu_context.h>
+#include <asm/ptrace.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+/*
+ * This routine handles page faults. It determines the address,
+ * and the problem, and then passes it off to one of the appropriate
+ * routines.
+ */
+asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
+ unsigned long address)
+{
+ struct vm_area_struct *vma = NULL;
+ struct task_struct *tsk = current;
+ struct mm_struct *mm = tsk->mm;
+ const int field = sizeof(unsigned long) * 2;
+ siginfo_t info;
+ int fault;
+
+ info.si_code = SEGV_MAPERR;
+
+ /*
+ * We fault-in kernel-space virtual memory on-demand. The
+ * 'reference' page table is init_mm.pgd.
+ *
+ * NOTE! We MUST NOT take any locks for this case. We may
+ * be in an interrupt or a critical region, and should
+ * only copy the information from the master page table,
+ * nothing more.
+ */
+ if (unlikely(address >= VMALLOC_START && address <= VMALLOC_END))
+ goto vmalloc_fault;
+#ifdef MODULE_START
+ if (unlikely(address >= MODULE_START && address < MODULE_END))
+ goto vmalloc_fault;
+#endif
+
+ /*
+ * If we're in an interrupt or have no user
+ * context, we must not take the fault..
+ */
+ if (in_atomic() || !mm)
+ goto bad_area_nosemaphore;
+
+ down_read(&mm->mmap_sem);
+ vma = find_vma(mm, address);
+ if (!vma)
+ goto bad_area;
+ if (vma->vm_start <= address)
+ goto good_area;
+ if (!(vma->vm_flags & VM_GROWSDOWN))
+ goto bad_area;
+ if (expand_stack(vma, address))
+ goto bad_area;
+ /*
+ * Ok, we have a good vm_area for this memory access, so
+ * we can handle it..
+ */
+good_area:
+ info.si_code = SEGV_ACCERR;
+
+ if (write) {
+ if (!(vma->vm_flags & VM_WRITE))
+ goto bad_area;
+ } else {
+ if (!(vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC)))
+ goto bad_area;
+ }
+
+survive:
+ /*
+ * If for any reason at all we couldn't handle the fault,
+ * make sure we exit gracefully rather than endlessly redo
+ * the fault.
+ */
+ fault = handle_mm_fault(mm, vma, address, write);
+ if (unlikely(fault & VM_FAULT_ERROR)) {
+ if (fault & VM_FAULT_OOM)
+ goto out_of_memory;
+ else if (fault & VM_FAULT_SIGBUS)
+ goto do_sigbus;
+ BUG();
+ }
+ if (fault & VM_FAULT_MAJOR)
+ tsk->maj_flt++;
+ else
+ tsk->min_flt++;
+
+ up_read(&mm->mmap_sem);
+ return;
+
+ /*
+ * Something tried to access memory that isn't in our memory map..
+ * Fix it, but check if it's kernel or user first..
+ */
+bad_area:
+ up_read(&mm->mmap_sem);
+
+bad_area_nosemaphore:
+ /* User mode accesses just cause a SIGSEGV */
+ if (user_mode(regs)) {
+ tsk->thread.cp0_badvaddr = address;
+ tsk->thread.error_code = write;
+ info.si_signo = SIGSEGV;
+ info.si_errno = 0;
+ /* info.si_code has been set above */
+ info.si_addr = (void __user *) address;
+ force_sig_info(SIGSEGV, &info, tsk);
+ return;
+ }
+
+no_context:
+ /* Are we prepared to handle this kernel fault? */
+ if (fixup_exception(regs)) {
+ current->thread.cp0_baduaddr = address;
+ return;
+ }
+
+ /*
+ * Oops. The kernel tried to access some bad page. We'll have to
+ * terminate things with extreme prejudice.
+ */
+ bust_spinlocks(1);
+
+ printk(KERN_ALERT "CPU %d Unable to handle kernel paging request
at "
+ "virtual address %0*lx, epc == %0*lx, ra ==
%0*lx\n",
+ 0, field, address, field, regs->cp0_epc,
+ field, regs->regs[3]);
+ die("Oops", regs);
+
+ /*
+ * We ran out of memory, or some other thing happened to us that
made
+ * us unable to handle the page fault gracefully.
+ */
+out_of_memory:
+ up_read(&mm->mmap_sem);
+ if (is_global_init(tsk)) {
+ yield();
+ down_read(&mm->mmap_sem);
+ goto survive;
+ }
+ printk("VM: killing process %s\n", tsk->comm);
+ if (user_mode(regs))
+ do_group_exit(SIGKILL);
+ goto no_context;
+
+do_sigbus:
+ up_read(&mm->mmap_sem);
+ /* Kernel mode? Handle exceptions or die */
+ if (!user_mode(regs))
+ goto no_context;
+ else
+ /*
+ * Send a sigbus, regardless of whether we were in kernel
+ * or user mode.
+ */
+ tsk->thread.cp0_badvaddr = address;
+ info.si_signo = SIGBUS;
+ info.si_errno = 0;
+ info.si_code = BUS_ADRERR;
+ info.si_addr = (void __user *) address;
+ force_sig_info(SIGBUS, &info, tsk);
+ return;
+vmalloc_fault:
+ {
+ /*
+ * Synchronize this task's top level page-table
+ * with the 'reference' page table.
+ *
+ * Do _not_ use "tsk" here. We might be inside
+ * an interrupt in the middle of a task switch..
+ */
+ int offset = __pgd_offset(address);
+ pgd_t *pgd, *pgd_k;
+ pud_t *pud, *pud_k;
+ pmd_t *pmd, *pmd_k;
+ pte_t *pte_k;
+
+ pgd = (pgd_t *) pgd_current + offset;
+ pgd_k = init_mm.pgd + offset;
+
+ if (!pgd_present(*pgd_k))
+ goto no_context;
+ set_pgd(pgd, *pgd_k);
+
+ pud = pud_offset(pgd, address);
+ pud_k = pud_offset(pgd_k, address);
+ if (!pud_present(*pud_k))
+ goto no_context;
+
+ pmd = pmd_offset(pud, address);
+ pmd_k = pmd_offset(pud_k, address);
+ if (!pmd_present(*pmd_k))
+ goto no_context;
+ set_pmd(pmd, *pmd_k);
+
+ pte_k = pte_offset_kernel(pmd_k, address);
+ if (!pte_present(*pte_k))
+ goto no_context;
+ return;
+ }
+}
diff -uprN -x linux-2.6-git.ori/Documentation/dontdiff
linux-2.6-git.ori/arch/score/mm/init.c
linux-2.6-git.new/arch/score/mm/init.c
--- linux-2.6-git.ori/arch/score/mm/init.c 1970-01-01
08:00:00.000000000 +0800
+++ linux-2.6-git.new/arch/score/mm/init.c 2009-04-08
10:31:13.000000000 +0800
@@ -0,0 +1,177 @@
+/*
+ * arch/score/mm/init.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Lennox Wu <lennox.wu@...plusct.com>
+ * Chen Liqin <liqin.chen@...plusct.com>
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/pagemap.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/proc_fs.h>
+#include <linux/pfn.h>
+#include <asm/asm-offsets.h>
+#include <asm/sections.h>
+#include <asm/pgtable.h>
+#include <asm/tlb.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+/*
+ * We have up to 8 empty zeroed pages so we can map one of the right
colour
+ * when needed.
+ */
+unsigned long zero_page_mask;
+unsigned long empty_zero_page;
+EXPORT_SYMBOL_GPL(empty_zero_page);
+
+static struct kcore_list kcore_mem, kcore_vmalloc;
+
+unsigned long setup_zero_pages(void)
+{
+ unsigned int order = 0;
+ unsigned long size;
+ struct page *page;
+
+ empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO,
order);
+ if (!empty_zero_page)
+ panic("Oh boy, that early out of memory?");
+
+ page = virt_to_page((void *) empty_zero_page);
+ split_page(page, order);
+ while (page < virt_to_page((void *) (empty_zero_page +
+ (PAGE_SIZE << order)))) {
+ SetPageReserved(page);
+ page++;
+ }
+
+ size = PAGE_SIZE << order;
+ zero_page_mask = (size - 1) & PAGE_MASK;
+
+ return 1UL << order;
+}
+
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+static int __init page_is_ram(unsigned long pagenr)
+{
+ if (pagenr >= min_low_pfn && pagenr < max_low_pfn)
+ return 1;
+ else
+ return 0;
+}
+
+void __init paging_init(void)
+{
+ unsigned long max_zone_pfns[MAX_NR_ZONES];
+ unsigned long lastpfn;
+
+ pagetable_init();
+ max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+ lastpfn = max_low_pfn;
+ free_area_init_nodes(max_zone_pfns);
+}
+
+void __init mem_init(void)
+{
+ unsigned long codesize, reservedpages, datasize, initsize;
+ unsigned long tmp, ram;
+
+ max_mapnr = max_low_pfn;
+ high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
+ totalram_pages += free_all_bootmem();
+ totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
+ reservedpages = ram = 0;
+
+ for (tmp = 0; tmp < max_low_pfn; tmp++)
+ if (page_is_ram(tmp)) {
+ ram++;
+ if (PageReserved(pfn_to_page(tmp)))
+ reservedpages++;
+ }
+
+ num_physpages = ram;
+ codesize = (unsigned long) &_etext - (unsigned long) &_text;
+ datasize = (unsigned long) &_edata - (unsigned long) &_etext;
+ initsize = (unsigned long) &__init_end - (unsigned long)
&__init_begin;
+
+ kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
+ kclist_add(&kcore_vmalloc, (void *) VMALLOC_START,
+ VMALLOC_END - VMALLOC_START);
+
+ printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
+ "%ldk reserved, %ldk data, %ldk init, %ldk
highmem)\n",
+ (unsigned long) nr_free_pages() <<
(PAGE_SHIFT-10),
+ ram << (PAGE_SHIFT-10), codesize >> 10,
+ reservedpages << (PAGE_SHIFT-10), datasize >> 10,
+ initsize >> 10,
+ (unsigned long) (totalhigh_pages <<
(PAGE_SHIFT-10)));
+}
+#endif /* !CONFIG_NEED_MULTIPLE_NODES */
+
+void free_init_pages(const char *what, unsigned long begin, unsigned long
end)
+{
+ unsigned long pfn;
+
+ for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
+ struct page *page = pfn_to_page(pfn);
+ void *addr = phys_to_virt(PFN_PHYS(pfn));
+
+ ClearPageReserved(page);
+ init_page_count(page);
+ memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
+ __free_page(page);
+ totalram_pages++;
+ }
+ printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin)
>> 10);
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+ free_init_pages("initrd memory",
+ virt_to_phys((void *) start),
+ virt_to_phys((void *) end));
+}
+#endif
+
+void __init_refok free_initmem(void)
+{
+ free_init_pages("unused kernel memory",
+ __pa_symbol(&__init_begin),
+ __pa_symbol(&__init_end));
+}
+
+unsigned long pgd_current;
+
+#define __page_aligned(order)
__attribute__((__aligned__(PAGE_SIZE<<order)))
+
+/*
+ * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and
PGD_ORDER
+ * are constants. So we use the variants from asm-offset.h until that
gcc
+ * will officially be retired.
+ */
+pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER);
+pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
diff -uprN -x linux-2.6-git.ori/Documentation/dontdiff
linux-2.6-git.ori/arch/score/mm/ioremap.c
linux-2.6-git.new/arch/score/mm/ioremap.c
--- linux-2.6-git.ori/arch/score/mm/ioremap.c 1970-01-01
08:00:00.000000000 +0800
+++ linux-2.6-git.new/arch/score/mm/ioremap.c 2009-04-03
09:57:10.000000000 +0800
@@ -0,0 +1,55 @@
+/*
+ * arch/score/mm/ioremap.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Lennox Wu <lennox.wu@...plusct.com>
+ * Chen Liqin <liqin.chen@...plusct.com>
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/vmalloc.h>
+#include <asm/io.h>
+#include <asm/fixmap.h>
+
+/*
+ * Remap an arbitrary physical address space into the kernel virtual
+ * address space. Needed when the kernel wants to access high addresses
+ * directly.
+ *
+ * NOTE! We need to allow non-page-aligned mappings too: we will
obviously
+ * have to convert them into an offset in a page-aligned mapping, but the
+ * caller shouldn't need to know that small detail.
+ */
+void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
unsigned long flags)
+{
+ if ((phys_addr > PHY_IO_BASE) &&
+ (phys_addr < (PHY_IO_BASE + IO_SPACE_SIZE)))
+ return (void *) (VIRTUAL_IO_BASE + phys_addr -
PHY_IO_BASE);
+ else
+ return NULL;
+}
+EXPORT_SYMBOL(__ioremap);
+
+void __iounmap(const volatile void __iomem *addr)
+{
+ return;
+}
+EXPORT_SYMBOL(__iounmap);
diff -uprN -x linux-2.6-git.ori/Documentation/dontdiff
linux-2.6-git.ori/arch/score/mm/Makefile
linux-2.6-git.new/arch/score/mm/Makefile
--- linux-2.6-git.ori/arch/score/mm/Makefile 1970-01-01
08:00:00.000000000 +0800
+++ linux-2.6-git.new/arch/score/mm/Makefile 2009-03-24
08:59:19.000000000 +0800
@@ -0,0 +1,10 @@
+#
+# Makefile for the Linux/SCORE-specific parts of the memory manager.
+#
+
+obj-y += cache.o dma-default.o extable.o fault.o init.o \
+ tlb-miss.o tlb-score.o ioremap.o pgtable.o
+
+obj-$(CONFIG_HIGHMEM) += highmem.o
+
+EXTRA_CFLAGS +=
diff -uprN -x linux-2.6-git.ori/Documentation/dontdiff
linux-2.6-git.ori/arch/score/mm/pgtable.c
linux-2.6-git.new/arch/score/mm/pgtable.c
--- linux-2.6-git.ori/arch/score/mm/pgtable.c 1970-01-01
08:00:00.000000000 +0800
+++ linux-2.6-git.new/arch/score/mm/pgtable.c 2009-03-23
14:31:51.000000000 +0800
@@ -0,0 +1,61 @@
+/*
+ * arch/score/mm/pgtable-32.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Lennox Wu <lennox.wu@...plusct.com>
+ * Chen Liqin <liqin.chen@...plusct.com>
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <asm/fixmap.h>
+#include <asm/pgtable.h>
+
+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;
+ }
+}
+
+void __init pagetable_init(void)
+{
+ unsigned long vaddr;
+ pgd_t *pgd_base;
+
+ /* Initialize the entire pgd. */
+ pgd_init((unsigned long) swapper_pg_dir);
+ pgd_init((unsigned long) swapper_pg_dir
+ + sizeof(pgd_t) * USER_PTRS_PER_PGD);
+
+ pgd_base = swapper_pg_dir;
+ vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
+}
diff -uprN -x linux-2.6-git.ori/Documentation/dontdiff
linux-2.6-git.ori/arch/score/mm/tlb-miss.S
linux-2.6-git.new/arch/score/mm/tlb-miss.S
--- linux-2.6-git.ori/arch/score/mm/tlb-miss.S 1970-01-01
08:00:00.000000000 +0800
+++ linux-2.6-git.new/arch/score/mm/tlb-miss.S 2009-04-07
21:34:54.000000000 +0800
@@ -0,0 +1,205 @@
+/*
+ * arch/score/mm/tlbex.S
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Lennox Wu <lennox.wu@...plusct.com>
+ * Chen Liqin <liqin.chen@...plusct.com>
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <asm/scoreregs.h>
+#include <asm/page.h>
+#include <asm/pgtable-bits.h>
+#include <asm/asm.h>
+
+/*
+* After this macro runs, the pte faulted on is
+* in register PTE, a ptr into the table in which
+* the pte belongs is in PTR.
+*/
+ .macro load_pte, pte, ptr
+ la \ptr, pgd_current
+ lw \ptr, [\ptr, 0]
+ mfcr \pte, cr6
+ srli \pte, \pte, 22
+ slli \pte, \pte, 2
+ add \ptr, \ptr, \pte
+ lw \ptr, [\ptr, 0]
+ mfcr \pte, cr6
+ srli \pte, \pte, 10
+ andi \pte, 0xffc
+ add \ptr, \ptr, \pte
+ lw \pte, [\ptr, 0]
+ .endm
+
+ .macro pte_reload, ptr
+ lw \ptr, [\ptr, 0]
+ mtcr \ptr, cr12
+ nop
+ nop
+ nop
+ nop
+ nop
+ .endm
+
+ .macro do_fault, write
+ SAVE_ALL
+ mfcr r6, cr6
+ mv r4, r0
+ ldi r5, \write
+ la r8, do_page_fault
+ brl r8
+ j ret_from_exception
+ .endm
+
+ .macro pte_writable, pte, ptr, label
+ andi \pte, 0x280
+ cmpi.c \pte, 0x280
+ bne \label
+ lw \pte, [\ptr, 0] /*reload PTE*/
+ .endm
+
+/*
+ * Make PTE writable, update software status bits as well,
+ * then store at PTR.
+ */
+ .macro pte_makewrite, pte, ptr
+ ori \pte, 0x426
+ sw \pte, [\ptr, 0]
+ .endm
+
+ .text
+ .globl score7_FTLB_refill_Handler
+score7_FTLB_refill_Handler:
+ la r31, pgd_current /* get pgd pointer */
+ lw r31, [r31, 0] /* get the address of PGD */
+ mfcr r30, cr6
+ srli r30, r30, 22 /* PGDIR_SHIFT = 22*/
+ slli r30, r30, 2
+ add r31, r31, r30
+ lw r31, [r31, 0] /* get the address of the start
address of PTE table */
+
+ mfcr r30, cr9
+ andi r30, 0xfff /* equivalent to get PET index and
right shift 2 bits */
+ add r31, r31, r30
+ lw r30, [r31, 0] /* load pte entry */
+ mtcr r30, cr12
+ nop
+ nop
+ nop
+ nop
+ nop
+ mtrtlb
+ nop
+ nop
+ nop
+ nop
+ nop
+ rte /* 6 cycles to make sure tlb entry
works */
+
+ .globl score7_KSEG_refill_Handler
+score7_KSEG_refill_Handler:
+ la r31, pgd_current /* get pgd pointer */
+ lw r31, [r31, 0] /* get the address of PGD */
+ mfcr r30, cr6
+ srli r30, r30, 22 /* PGDIR_SHIFT = 22 */
+ slli r30, r30, 2
+ add r31, r31, r30
+ lw r31, [r31, 0] /* get the address of the start
address of PTE table */
+
+ mfcr r30, cr6 /* get Bad VPN */
+ srli r30, r30, 10
+ andi r30, 0xffc /* PTE VPN mask (bit 11~2) */
+
+ add r31, r31, r30
+ lw r30, [r31, 0] /* load pte entry */
+ mtcr r30, cr12
+ nop
+ nop
+ nop
+ nop
+ nop
+ mtrtlb
+ nop
+ nop
+ nop
+ nop
+ nop
+ rte /* 6 cycles to make sure tlb entry
works */
+
+nopage_tlbl:
+ do_fault 0 /* Read */
+
+ .globl handle_tlb_refill
+handle_tlb_refill:
+ load_pte r30, r31
+ pte_writable r30, r31, handle_tlb_refill_nopage
+ pte_makewrite r30, r31 /* Access|Modify|Dirty|Valid */
+ pte_reload r31
+ mtrtlb
+ nop
+ nop
+ nop
+ nop
+ nop
+ rte
+handle_tlb_refill_nopage:
+ do_fault 0 /* Read */
+
+ .globl handle_tlb_invaild
+handle_tlb_invaild:
+ load_pte r30, r31
+ stlb /* find faulting entry */
+ pte_writable r30, r31, handle_tlb_invaild_nopage
+ pte_makewrite r30, r31 /* Access|Modify|Dirty|Valid */
+ pte_reload r31
+ mtptlb
+ nop
+ nop
+ nop
+ nop
+ nop
+ rte
+handle_tlb_invaild_nopage:
+ do_fault 0 /* Read */
+
+ .globl handle_mod
+handle_mod:
+ load_pte r30, r31
+ stlb /* find faulting entry */
+ andi r30, _PAGE_WRITE /* Writable? */
+ cmpz.c r30
+ beq nowrite_mod
+ lw r30, [r31, 0] /* reload into r30 */
+
+ /* Present and writable bits set, set accessed and dirty bits. */
+ pte_makewrite r30, r31
+
+ /* Now reload the entry into the tlb. */
+ pte_reload r31
+ mtptlb
+ nop
+ nop
+ nop
+ nop
+ nop
+ rte
+
+nowrite_mod:
+ do_fault 1 /* Write */
diff -uprN -x linux-2.6-git.ori/Documentation/dontdiff
linux-2.6-git.ori/arch/score/mm/tlb-score.c
linux-2.6-git.new/arch/score/mm/tlb-score.c
--- linux-2.6-git.ori/arch/score/mm/tlb-score.c 1970-01-01
08:00:00.000000000 +0800
+++ linux-2.6-git.new/arch/score/mm/tlb-score.c 2009-04-07
21:50:37.000000000 +0800
@@ -0,0 +1,249 @@
+/*
+ * arch/score/mm/tlb-score.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Lennox Wu <lennox.wu@...plusct.com>
+ * Chen Liqin <liqin.chen@...plusct.com>
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/highmem.h>
+#include <asm/irq.h>
+#include <asm/mmu_context.h>
+#include <asm/pgtable.h>
+#include <asm/tlb.h>
+
+#define TLBSIZE 32
+
+unsigned long asid_cache = ASID_FIRST_VERSION;
+EXPORT_SYMBOL(asid_cache);
+
+void local_flush_tlb_all(void)
+{
+ unsigned long flags;
+ unsigned long old_ASID;
+ int entry;
+
+ local_irq_save(flags);
+ old_ASID = (get_PEVN() & ASID_MASK);
+ set_PECTX(0); /* invalid */
+ entry = get_TLBLOCK(); /* skip locked entries*/
+
+ for (; entry < TLBSIZE; entry++) {
+ set_TLBPT(entry);
+ set_PEVN(KSEG1);
+ barrier();
+ tlb_write_indexed();
+ }
+ set_PEVN(old_ASID);
+ local_irq_restore(flags);
+}
+
+/*
+ * If mm is currently active_mm, we can't really drop it. Instead,
+ * we will get a new one for it.
+ */
+static inline void
+drop_mmu_context(struct mm_struct *mm, unsigned cpu)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ get_new_mmu_context(mm, 0);
+ set_PEVN(cpu_asid(0, mm));
+ local_irq_restore(flags);
+}
+
+void local_flush_tlb_mm(struct mm_struct *mm)
+{
+ if (cpu_context(0, mm) != 0)
+ drop_mmu_context(mm, 0);
+}
+
+void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long
start,
+ unsigned long end)
+{
+ struct mm_struct *mm = vma->vm_mm;
+ unsigned long vma_mm_context = mm->context[0];
+ if (mm->context != 0) {
+ unsigned long flags;
+ int size;
+
+ local_irq_save(flags);
+ size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
+ if (size <= TLBSIZE) {
+ int oldpid = (get_PEVN() & ASID_MASK);
+ int newpid = vma_mm_context & ASID_MASK;
+
+ start &= PAGE_MASK;
+ end += (PAGE_SIZE - 1);
+ end &= PAGE_MASK;
+ while (start < end) {
+ int idx;
+
+ set_PEVN(start | newpid);
+ start += PAGE_SIZE;
+ barrier();
+ tlb_probe();
+ idx = get_TLBPT();
+ set_PECTX(0);
+ set_PEVN(KSEG1);
+ if (idx < 0)
+ continue;
+ tlb_write_indexed();
+ }
+ set_PEVN(oldpid);
+ } else {
+ /* Bigger than TLBSIZE, get new ASID directly */
+ get_new_mmu_context(mm, 0);
+ if (mm == current->active_mm)
+ set_PEVN(vma_mm_context & ASID_MASK);
+ }
+ local_irq_restore(flags);
+ }
+}
+
+void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+ unsigned long flags;
+ int size;
+
+ local_irq_save(flags);
+ size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
+ if (size <= TLBSIZE) {
+ int pid = get_PEVN();
+
+ start &= PAGE_MASK;
+ end += PAGE_SIZE - 1;
+ end &= PAGE_MASK;
+
+ while (start < end) {
+ long idx;
+
+ set_PEVN(start);
+ start += PAGE_SIZE;
+ tlb_probe();
+ idx = get_TLBPT();
+ if (idx < 0)
+ continue;
+ set_PECTX(0);
+ set_PEVN(KSEG1);
+ barrier();
+ tlb_write_indexed();
+ }
+ set_PEVN(pid);
+ } else {
+ local_flush_tlb_all();
+ }
+
+ local_irq_restore(flags);
+}
+
+void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
+{
+ if (!vma || vma->vm_mm->context != 0) {
+ unsigned long flags;
+ int oldpid, newpid, idx;
+ unsigned long vma_ASID = vma->vm_mm->context[0];
+
+ newpid = (vma_ASID & ASID_MASK);
+ page &= PAGE_MASK;
+ local_irq_save(flags);
+ oldpid = (get_PEVN() & ASID_MASK);
+ set_PEVN(page | newpid);
+ barrier();
+ tlb_probe();
+ idx = get_TLBPT();
+ set_PECTX(0);
+ set_PEVN(KSEG1);
+ if (idx < 0) /* p_bit(31) - 1: miss, 0: hit*/
+ goto finish;
+ barrier();
+ tlb_write_indexed();
+finish:
+ set_PEVN(oldpid);
+ local_irq_restore(flags);
+ }
+}
+
+/*
+ * This one is only used for pages with the global bit set so we don't
care
+ * much about the ASID.
+ */
+void local_flush_tlb_one(unsigned long page)
+{
+ unsigned long flags;
+ int oldpid, idx;
+
+ local_irq_save(flags);
+ oldpid = get_PEVN();
+ page &= (PAGE_MASK << 1);
+ set_PEVN(page);
+ barrier();
+ tlb_probe();
+ idx = get_TLBPT();
+ set_PECTX(0);
+ if (idx >= 0) {
+ /* Make sure all entries differ. */
+ set_PEVN(KSEG1);
+ barrier();
+ tlb_write_indexed();
+ }
+ set_PEVN(oldpid);
+ local_irq_restore(flags);
+}
+
+void __update_tlb(struct vm_area_struct *vma, unsigned long address,
pte_t pte)
+{
+ unsigned long flags;
+ int idx, pid;
+
+ /*
+ * Handle debugger faulting in for debugee.
+ */
+ if (current->active_mm != vma->vm_mm)
+ return;
+
+ pid = get_PEVN() & ASID_MASK;
+
+ local_irq_save(flags);
+ address &= PAGE_MASK;
+ set_PEVN(address | pid);
+ barrier();
+ tlb_probe();
+ idx = get_TLBPT();
+ set_PECTX(pte_val(pte));
+ set_PEVN(address | pid);
+ if (idx < 0)
+ tlb_write_random();
+ else
+ tlb_write_indexed();
+
+ set_PEVN(pid);
+ local_irq_restore(flags);
+}
+
+void __cpuinit tlb_init(void)
+{
+ set_TLBLOCK(0);
+ local_flush_tlb_all();
+ memcpy((void *)(EXCEPTION_VECTOR_BASE_ADDR + 0x100),
&score7_FTLB_refill_Handler, 0xFC);
+ flush_icache_range(EXCEPTION_VECTOR_BASE_ADDR + 0x100,
EXCEPTION_VECTOR_BASE_ADDR + 0x1FC);
+}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists