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-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIVAwUAT3NKzROxKuMESys7AQKElw/+JyDxJSlj+g+nymkx8IVVuU8CsEwNLgRk 8KEnRfLhGtkXFLSJYWO6jzGo16F8Uqli1PdMFte/wagSv0285/HZaKlkkBVHdJ/m u40oSjgT013bBh6MQ0Oaf8pFezFUiQB5zPOA9QGaLVGDLXCmgqUgd7exaD5wRIwB ZmyItjZeAVnDfk1R+ZiNYytHAi8A5wSB+eFDCIQYgyulA1Igd1UnRtx+dRKbvc/m rWQ6KWbZHIdvP1ksd8wHHkrlUD2pEeJ8glJLsZUhMm/5oMf/8RmOCvmo8rvE/qwl eDQ1h4cGYlfjobxXZMHqAN9m7Jg2bI946HZjdb7/7oCeO6VW3FwPZ/Ic75p+wp45 HXJTItufERYk6QxShiOKvA+QexnYwY0IT5oRP4DrhdVB/X9cl2MoaZHC+RbYLQy+ /5VNZKi38iK4F9AbFamS7kd0i5QszA/ZzEzKZ6VMuOp3W/fagpn4ZJT1LIA3m4A9 Q0cj24mqeyCfjysu0TMbPtaN+Yjeu1o1OFRvM8XffbZsp5bNzuTDEvviJ2NXw4vK 4qUHulhYSEWcu9YgAZXvEWDEM78FXCkg2v/CrZXH5tyc95kUkMPcgG+QZBB5wElR FaOKpiC/BuNIGEf02IZQ4nfDxE90QwnDeoYeV+FvNj9UEOopJ5z5bMPoTHxm4cCD NypQthI85pc= =G9mT -----END PGP SIGNATURE----- Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system Pull "Disintegrate and delete asm/system.h" from David Howells: "Here are a bunch of patches to disintegrate asm/system.h into a set of separate bits to relieve the problem of circular inclusion dependencies. I've built all the working defconfigs from all the arches that I can and made sure that they don't break. The reason for these patches is that I recently encountered a circular dependency problem that came about when I produced some patches to optimise get_order() by rewriting it to use ilog2(). This uses bitops - and on the SH arch asm/bitops.h drags in asm-generic/get_order.h by a circuituous route involving asm/system.h. The main difficulty seems to be asm/system.h. It holds a number of low level bits with no/few dependencies that are commonly used (eg. memory barriers) and a number of bits with more dependencies that aren't used in many places (eg. switch_to()). These patches break asm/system.h up into the following core pieces: (1) asm/barrier.h Move memory barriers here. This already done for MIPS and Alpha. (2) asm/switch_to.h Move switch_to() and related stuff here. (3) asm/exec.h Move arch_align_stack() here. Other process execution related bits could perhaps go here from asm/processor.h. (4) asm/cmpxchg.h Move xchg() and cmpxchg() here as they're full word atomic ops and frequently used by atomic_xchg() and atomic_cmpxchg(). (5) asm/bug.h Move die() and related bits. (6) asm/auxvec.h Move AT_VECTOR_SIZE_ARCH here. Other arch headers are created as needed on a per-arch basis." Fixed up some conflicts from other header file cleanups and moving code around that has happened in the meantime, so David's testing is somewhat weakened by that. We'll find out anything that got broken and fix it.. * tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits) Delete all instances of asm/system.h Remove all #inclusions of asm/system.h Add #includes needed to permit the removal of asm/system.h Move all declarations of free_initmem() to linux/mm.h Disintegrate asm/system.h for OpenRISC Split arch_align_stack() out from asm-generic/system.h Split the switch_to() wrapper out of asm-generic/system.h Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h Create asm-generic/barrier.h Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h Disintegrate asm/system.h for Xtensa Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt] Disintegrate asm/system.h for Tile Disintegrate asm/system.h for Sparc Disintegrate asm/system.h for SH Disintegrate asm/system.h for Score Disintegrate asm/system.h for S390 Disintegrate asm/system.h for PowerPC Disintegrate asm/system.h for PA-RISC Disintegrate asm/system.h for MN10300 ...
282 lines
7 KiB
C
282 lines
7 KiB
C
/*
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* OpenRISC idle.c
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*
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* Linux architectural port borrowing liberally from similar works of
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* others. All original copyrights apply as per the original source
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* declaration.
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*
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* Modifications for the OpenRISC architecture:
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/smp.h>
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#include <linux/bootmem.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/blkdev.h> /* for initrd_* */
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#include <linux/pagemap.h>
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#include <linux/memblock.h>
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#include <asm/segment.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/dma.h>
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#include <asm/io.h>
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#include <asm/tlb.h>
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#include <asm/mmu_context.h>
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#include <asm/kmap_types.h>
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#include <asm/fixmap.h>
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#include <asm/tlbflush.h>
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int mem_init_done;
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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static void __init zone_sizes_init(void)
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{
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unsigned long zones_size[MAX_NR_ZONES];
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/* Clear the zone sizes */
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memset(zones_size, 0, sizeof(zones_size));
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/*
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* We use only ZONE_NORMAL
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*/
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zones_size[ZONE_NORMAL] = max_low_pfn;
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free_area_init(zones_size);
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}
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extern const char _s_kernel_ro[], _e_kernel_ro[];
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/*
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* Map all physical memory into kernel's address space.
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*
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* This is explicitly coded for two-level page tables, so if you need
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* something else then this needs to change.
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*/
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static void __init map_ram(void)
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{
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unsigned long v, p, e;
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pgprot_t prot;
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pgd_t *pge;
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pud_t *pue;
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pmd_t *pme;
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pte_t *pte;
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/* These mark extents of read-only kernel pages...
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* ...from vmlinux.lds.S
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*/
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struct memblock_region *region;
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v = PAGE_OFFSET;
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for_each_memblock(memory, region) {
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p = (u32) region->base & PAGE_MASK;
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e = p + (u32) region->size;
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v = (u32) __va(p);
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pge = pgd_offset_k(v);
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while (p < e) {
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int j;
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pue = pud_offset(pge, v);
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pme = pmd_offset(pue, v);
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if ((u32) pue != (u32) pge || (u32) pme != (u32) pge) {
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panic("%s: OR1K kernel hardcoded for "
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"two-level page tables",
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__func__);
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}
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/* Alloc one page for holding PTE's... */
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pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
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set_pmd(pme, __pmd(_KERNPG_TABLE + __pa(pte)));
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/* Fill the newly allocated page with PTE'S */
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for (j = 0; p < e && j < PTRS_PER_PGD;
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v += PAGE_SIZE, p += PAGE_SIZE, j++, pte++) {
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if (v >= (u32) _e_kernel_ro ||
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v < (u32) _s_kernel_ro)
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prot = PAGE_KERNEL;
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else
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prot = PAGE_KERNEL_RO;
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set_pte(pte, mk_pte_phys(p, prot));
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}
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pge++;
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}
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printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
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region->base, region->base + region->size);
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}
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}
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void __init paging_init(void)
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{
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extern void tlb_init(void);
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unsigned long end;
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int i;
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printk(KERN_INFO "Setting up paging and PTEs.\n");
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/* clear out the init_mm.pgd that will contain the kernel's mappings */
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for (i = 0; i < PTRS_PER_PGD; i++)
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swapper_pg_dir[i] = __pgd(0);
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/* make sure the current pgd table points to something sane
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* (even if it is most probably not used until the next
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* switch_mm)
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*/
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current_pgd = init_mm.pgd;
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end = (unsigned long)__va(max_low_pfn * PAGE_SIZE);
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map_ram();
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zone_sizes_init();
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/* self modifying code ;) */
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/* Since the old TLB miss handler has been running up until now,
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* the kernel pages are still all RW, so we can still modify the
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* text directly... after this change and a TLB flush, the kernel
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* pages will become RO.
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*/
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{
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extern unsigned long dtlb_miss_handler;
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extern unsigned long itlb_miss_handler;
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unsigned long *dtlb_vector = __va(0x900);
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unsigned long *itlb_vector = __va(0xa00);
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printk(KERN_INFO "dtlb_miss_handler %p\n", &dtlb_miss_handler);
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*dtlb_vector = ((unsigned long)&dtlb_miss_handler -
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(unsigned long)dtlb_vector) >> 2;
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printk(KERN_INFO "itlb_miss_handler %p\n", &itlb_miss_handler);
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*itlb_vector = ((unsigned long)&itlb_miss_handler -
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(unsigned long)itlb_vector) >> 2;
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}
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/* Invalidate instruction caches after code modification */
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mtspr(SPR_ICBIR, 0x900);
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mtspr(SPR_ICBIR, 0xa00);
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/* New TLB miss handlers and kernel page tables are in now place.
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* Make sure that page flags get updated for all pages in TLB by
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* flushing the TLB and forcing all TLB entries to be recreated
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* from their page table flags.
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*/
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flush_tlb_all();
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}
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/* References to section boundaries */
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extern char _stext, _etext, _edata, __bss_start, _end;
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extern char __init_begin, __init_end;
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static int __init free_pages_init(void)
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{
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int reservedpages, pfn;
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/* this will put all low memory onto the freelists */
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totalram_pages = free_all_bootmem();
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reservedpages = 0;
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for (pfn = 0; pfn < max_low_pfn; pfn++) {
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/*
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* Only count reserved RAM pages
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*/
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if (PageReserved(mem_map + pfn))
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reservedpages++;
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}
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return reservedpages;
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}
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static void __init set_max_mapnr_init(void)
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{
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max_mapnr = num_physpages = max_low_pfn;
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}
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void __init mem_init(void)
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{
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int codesize, reservedpages, datasize, initsize;
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BUG_ON(!mem_map);
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set_max_mapnr_init();
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high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
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/* clear the zero-page */
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memset((void *)empty_zero_page, 0, PAGE_SIZE);
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reservedpages = free_pages_init();
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codesize = (unsigned long)&_etext - (unsigned long)&_stext;
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datasize = (unsigned long)&_edata - (unsigned long)&_etext;
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initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
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printk(KERN_INFO
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"Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
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(unsigned long)nr_free_pages() << (PAGE_SHIFT - 10),
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max_mapnr << (PAGE_SHIFT - 10), codesize >> 10,
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reservedpages << (PAGE_SHIFT - 10), datasize >> 10,
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initsize >> 10, (unsigned long)(0 << (PAGE_SHIFT - 10))
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);
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printk("mem_init_done ...........................................\n");
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mem_init_done = 1;
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return;
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
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(end - start) >> 10);
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for (; start < end; start += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(start));
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init_page_count(virt_to_page(start));
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free_page(start);
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totalram_pages++;
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}
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}
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#endif
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void free_initmem(void)
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{
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unsigned long addr;
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addr = (unsigned long)(&__init_begin);
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for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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free_page(addr);
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totalram_pages++;
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}
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printk(KERN_INFO "Freeing unused kernel memory: %luk freed\n",
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((unsigned long)&__init_end -
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(unsigned long)&__init_begin) >> 10);
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}
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