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Message-ID: <OF6C8C1388.34499E4F-ON482575D0.00246FC1-482575D0.0024E068@sunplusct.com>
Date: Tue, 9 Jun 2009 14:38:30 +0800
From: liqin.chen@...plusct.com
To: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>,
Andrew Morton <akpm@...ux-foundation.org>,
torvalds@...ux-foundation.org
Subject: [PATCH 26/27] score: create mm files cache.c extable.c fault.c init.c
>From a8b318df27a959dc552d99f6502e24e35b33e2a1 Mon Sep 17 00:00:00 2001
From: Chen Liqin <liqin.chen@...plusct.com>
Date: Tue, 9 Jun 2009 13:43:19 +0800
Subject: [PATCH 26/27] score: create mm files cache.c extable.c fault.c
init.c
Signed-off-by: Chen Liqin <liqin.chen@...plusct.com>
---
arch/score/mm/cache.c | 308
+++++++++++++++++++++++++++++++++++++++++++++++
arch/score/mm/extable.c | 38 ++++++
arch/score/mm/fault.c | 235 ++++++++++++++++++++++++++++++++++++
arch/score/mm/init.c | 173 ++++++++++++++++++++++++++
4 files changed, 754 insertions(+), 0 deletions(-)
create mode 100644 arch/score/mm/cache.c
create mode 100644 arch/score/mm/extable.c
create mode 100644 arch/score/mm/fault.c
create mode 100644 arch/score/mm/init.c
diff --git a/arch/score/mm/cache.c b/arch/score/mm/cache.c
new file mode 100644
index 0000000..1ebc67f
--- /dev/null
+++ b/arch/score/mm/cache.c
@@ -0,0 +1,308 @@
+/*
+ * 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/linkage.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/sched.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) && test_bit(PG_arch_1, &page->flags)) {
+ addr = (unsigned long) page_address(page);
+ if (exec)
+ s7_flush_data_cache_page(addr);
+ clear_bit(PG_arch_1, &page->flags);
+ }
+}
+
+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 (!(mm->context))
+ 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 (!(mm->context))
+ 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 / L1_CACHE_BYTES); i += L1_CACHE_BYTES)
{
+ __asm__ __volatile__(
+ "cache 0x0e, [%0, 0]\n"
+ "cache 0x1a, [%0, 0]\n"
+ "nop\n"
+ : : "r" (addr));
+ addr += L1_CACHE_BYTES;
+ }
+}
+
+/*
+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 & ~(L1_CACHE_BYTES - 1);
+ end = end & ~(L1_CACHE_BYTES - 1);
+ size = end - start;
+ /* flush dcache to ram, and invalidate dcache lines. */
+ for (i = 0; i < size; i += L1_CACHE_BYTES) {
+ __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 += L1_CACHE_BYTES;
+ }
+}
+
+static void s7_flush_icache_range(unsigned long start, unsigned long end)
+{
+ int size, i;
+ start = start & ~(L1_CACHE_BYTES - 1);
+ end = end & ~(L1_CACHE_BYTES - 1);
+
+ size = end - start;
+ /* invalidate icache lines. */
+ for (i = 0; i < size; i += L1_CACHE_BYTES) {
+ __asm__ __volatile__(
+ "cache 0x02, [%0, 0]\n"
+ "nop\nnop\nnop\nnop\nnop\n"
+ : : "r" (start));
+ start += L1_CACHE_BYTES;
+ }
+}
diff --git a/arch/score/mm/extable.c b/arch/score/mm/extable.c
new file mode 100644
index 0000000..01ff644
--- /dev/null
+++ b/arch/score/mm/extable.c
@@ -0,0 +1,38 @@
+/*
+ * 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>
+
+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->fixup;
+ return 1;
+ }
+ return 0;
+}
diff --git a/arch/score/mm/fault.c b/arch/score/mm/fault.c
new file mode 100644
index 0000000..47b600e
--- /dev/null
+++ b/arch/score/mm/fault.c
@@ -0,0 +1,235 @@
+/*
+ * 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/errno.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.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 --git a/arch/score/mm/init.c b/arch/score/mm/init.c
new file mode 100644
index 0000000..7780eec
--- /dev/null
+++ b/arch/score/mm/init.c
@@ -0,0 +1,173 @@
+/*
+ * 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/errno.h>
+#include <linux/bootmem.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/pagemap.h>
+#include <linux/proc_fs.h>
+#include <linux/sched.h>
+#include <asm-generic/sections.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 = 0;
+
+ 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 = 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",
+ (unsigned long)__init_begin, (unsigned long)__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.
+ */
+pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
--
1.6.2
--
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