--- /dev/null
+/*
+ * OpenRISC idle.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others. All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ * 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.
+ */
+
+#include <linux/signal.h>
+#include <linux/sched.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/swap.h>
+#include <linux/smp.h>
+#include <linux/bootmem.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/blkdev.h> /* for initrd_* */
+#include <linux/pagemap.h>
+#include <linux/memblock.h>
+
+#include <asm/segment.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/dma.h>
+#include <asm/io.h>
+#include <asm/tlb.h>
+#include <asm/mmu_context.h>
+#include <asm/kmap_types.h>
+#include <asm/fixmap.h>
+#include <asm/tlbflush.h>
+#include <asm/sections.h>
+
+int mem_init_done;
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+static void __init zone_sizes_init(void)
+{
+ unsigned long zones_size[MAX_NR_ZONES];
+
+ /* Clear the zone sizes */
+ memset(zones_size, 0, sizeof(zones_size));
+
+ /*
+ * We use only ZONE_NORMAL
+ */
+ zones_size[ZONE_NORMAL] = max_low_pfn;
+
+ free_area_init(zones_size);
+}
+
+extern const char _s_kernel_ro[], _e_kernel_ro[];
+
+/*
+ * Map all physical memory into kernel's address space.
+ *
+ * This is explicitly coded for two-level page tables, so if you need
+ * something else then this needs to change.
+ */
+static void __init map_ram(void)
+{
+ unsigned long v, p, e;
+ pgprot_t prot;
+ pgd_t *pge;
+ pud_t *pue;
+ pmd_t *pme;
+ pte_t *pte;
+ /* These mark extents of read-only kernel pages...
+ * ...from vmlinux.lds.S
+ */
+ struct memblock_region *region;
+
+ v = PAGE_OFFSET;
+
+ for_each_memblock(memory, region) {
+ p = (u32) region->base & PAGE_MASK;
+ e = p + (u32) region->size;
+
+ v = (u32) __va(p);
+ pge = pgd_offset_k(v);
+
+ while (p < e) {
+ int j;
+ pue = pud_offset(pge, v);
+ pme = pmd_offset(pue, v);
+
+ if ((u32) pue != (u32) pge || (u32) pme != (u32) pge) {
+ panic("%s: OR1K kernel hardcoded for "
+ "two-level page tables",
+ __func__);
+ }
+
+ /* Alloc one page for holding PTE's... */
+ pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+ set_pmd(pme, __pmd(_KERNPG_TABLE + __pa(pte)));
+
+ /* Fill the newly allocated page with PTE'S */
+ for (j = 0; p < e && j < PTRS_PER_PGD;
+ v += PAGE_SIZE, p += PAGE_SIZE, j++, pte++) {
+ if (v >= (u32) _e_kernel_ro ||
+ v < (u32) _s_kernel_ro)
+ prot = PAGE_KERNEL;
+ else
+ prot = PAGE_KERNEL_RO;
+
+ set_pte(pte, mk_pte_phys(p, prot));
+ }
+
+ pge++;
+ }
+
+ printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
+ region->base, region->base + region->size);
+ }
+}
+
+void __init paging_init(void)
+{
+ extern void tlb_init(void);
+
+ unsigned long end;
+ int i;
+
+ printk(KERN_INFO "Setting up paging and PTEs.\n");
+
+ /* clear out the init_mm.pgd that will contain the kernel's mappings */
+
+ for (i = 0; i < PTRS_PER_PGD; i++)
+ swapper_pg_dir[i] = __pgd(0);
+
+ /* make sure the current pgd table points to something sane
+ * (even if it is most probably not used until the next
+ * switch_mm)
+ */
+ current_pgd = init_mm.pgd;
+
+ end = (unsigned long)__va(max_low_pfn * PAGE_SIZE);
+
+ map_ram();
+
+ zone_sizes_init();
+
+ /* self modifying code ;) */
+ /* Since the old TLB miss handler has been running up until now,
+ * the kernel pages are still all RW, so we can still modify the
+ * text directly... after this change and a TLB flush, the kernel
+ * pages will become RO.
+ */
+ {
+ extern unsigned long dtlb_miss_handler;
+ extern unsigned long itlb_miss_handler;
+
+ unsigned long *dtlb_vector = __va(0x900);
+ unsigned long *itlb_vector = __va(0xa00);
+
+ printk(KERN_INFO "itlb_miss_handler %p\n", &itlb_miss_handler);
+ *itlb_vector = ((unsigned long)&itlb_miss_handler -
+ (unsigned long)itlb_vector) >> 2;
+
+ /* Soft ordering constraint to ensure that dtlb_vector is
+ * the last thing updated
+ */
+ barrier();
+
+ printk(KERN_INFO "dtlb_miss_handler %p\n", &dtlb_miss_handler);
+ *dtlb_vector = ((unsigned long)&dtlb_miss_handler -
+ (unsigned long)dtlb_vector) >> 2;
+
+ }
+
+ /* Soft ordering constraint to ensure that cache invalidation and
+ * TLB flush really happen _after_ code has been modified.
+ */
+ barrier();
+
+ /* Invalidate instruction caches after code modification */
+ mtspr(SPR_ICBIR, 0x900);
+ mtspr(SPR_ICBIR, 0xa00);
+
+ /* New TLB miss handlers and kernel page tables are in now place.
+ * Make sure that page flags get updated for all pages in TLB by
+ * flushing the TLB and forcing all TLB entries to be recreated
+ * from their page table flags.
+ */
+ flush_tlb_all();
+}
+
+/* References to section boundaries */
+
+void __init mem_init(void)
+{
+ BUG_ON(!mem_map);
+
+ max_mapnr = max_low_pfn;
+ high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
+
+ /* clear the zero-page */
+ memset((void *)empty_zero_page, 0, PAGE_SIZE);
+
+ /* this will put all low memory onto the freelists */
+ free_all_bootmem();
+
+ mem_init_print_info(NULL);
+
+ printk("mem_init_done ...........................................\n");
+ mem_init_done = 1;
+ return;
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+ free_reserved_area((void *)start, (void *)end, -1, "initrd");
+}
+#endif
+
+void free_initmem(void)
+{
+ free_initmem_default(-1);
+}
Code Review / kvmfornfv.git / blobdiff