![Mike Rapoport](/assets/img/avatar_default.png)
Patch series "mm: consolidate definitions of page table accessors", v2. The low level page table accessors (pXY_index(), pXY_offset()) are duplicated across all architectures and sometimes more than once. For instance, we have 31 definition of pgd_offset() for 25 supported architectures. Most of these definitions are actually identical and typically it boils down to, e.g. static inline unsigned long pmd_index(unsigned long address) { return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); } static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) { return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); } These definitions can be shared among 90% of the arches provided XYZ_SHIFT, PTRS_PER_XYZ and xyz_page_vaddr() are defined. For architectures that really need a custom version there is always possibility to override the generic version with the usual ifdefs magic. These patches introduce include/linux/pgtable.h that replaces include/asm-generic/pgtable.h and add the definitions of the page table accessors to the new header. This patch (of 12): The linux/mm.h header includes <asm/pgtable.h> to allow inlining of the functions involving page table manipulations, e.g. pte_alloc() and pmd_alloc(). So, there is no point to explicitly include <asm/pgtable.h> in the files that include <linux/mm.h>. The include statements in such cases are remove with a simple loop: for f in $(git grep -l "include <linux/mm.h>") ; do sed -i -e '/include <asm\/pgtable.h>/ d' $f done Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Mike Rapoport <rppt@kernel.org> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-1-rppt@kernel.org Link: http://lkml.kernel.org/r/20200514170327.31389-2-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
215 lines
5.6 KiB
C
215 lines
5.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* arch/alpha/boot/bootp.c
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*
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* Copyright (C) 1997 Jay Estabrook
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*
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* This file is used for creating a bootp file for the Linux/AXP kernel
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*
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* based significantly on the arch/alpha/boot/main.c of Linus Torvalds
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <generated/utsrelease.h>
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#include <linux/mm.h>
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#include <asm/console.h>
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#include <asm/hwrpb.h>
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#include <asm/io.h>
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#include <stdarg.h>
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#include "ksize.h"
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extern unsigned long switch_to_osf_pal(unsigned long nr,
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struct pcb_struct * pcb_va, struct pcb_struct * pcb_pa,
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unsigned long *vptb);
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extern void move_stack(unsigned long new_stack);
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struct hwrpb_struct *hwrpb = INIT_HWRPB;
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static struct pcb_struct pcb_va[1];
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/*
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* Find a physical address of a virtual object..
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*
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* This is easy using the virtual page table address.
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*/
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static inline void *
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find_pa(unsigned long *vptb, void *ptr)
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{
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unsigned long address = (unsigned long) ptr;
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unsigned long result;
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result = vptb[address >> 13];
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result >>= 32;
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result <<= 13;
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result |= address & 0x1fff;
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return (void *) result;
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}
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/*
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* This function moves into OSF/1 pal-code, and has a temporary
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* PCB for that. The kernel proper should replace this PCB with
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* the real one as soon as possible.
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*
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* The page table muckery in here depends on the fact that the boot
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* code has the L1 page table identity-map itself in the second PTE
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* in the L1 page table. Thus the L1-page is virtually addressable
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* itself (through three levels) at virtual address 0x200802000.
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*/
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#define VPTB ((unsigned long *) 0x200000000)
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#define L1 ((unsigned long *) 0x200802000)
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void
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pal_init(void)
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{
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unsigned long i, rev;
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struct percpu_struct * percpu;
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struct pcb_struct * pcb_pa;
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/* Create the dummy PCB. */
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pcb_va->ksp = 0;
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pcb_va->usp = 0;
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pcb_va->ptbr = L1[1] >> 32;
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pcb_va->asn = 0;
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pcb_va->pcc = 0;
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pcb_va->unique = 0;
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pcb_va->flags = 1;
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pcb_va->res1 = 0;
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pcb_va->res2 = 0;
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pcb_pa = find_pa(VPTB, pcb_va);
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/*
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* a0 = 2 (OSF)
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* a1 = return address, but we give the asm the vaddr of the PCB
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* a2 = physical addr of PCB
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* a3 = new virtual page table pointer
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* a4 = KSP (but the asm sets it)
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*/
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srm_printk("Switching to OSF PAL-code .. ");
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i = switch_to_osf_pal(2, pcb_va, pcb_pa, VPTB);
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if (i) {
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srm_printk("failed, code %ld\n", i);
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__halt();
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}
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percpu = (struct percpu_struct *)
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(INIT_HWRPB->processor_offset + (unsigned long) INIT_HWRPB);
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rev = percpu->pal_revision = percpu->palcode_avail[2];
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srm_printk("Ok (rev %lx)\n", rev);
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tbia(); /* do it directly in case we are SMP */
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}
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static inline void
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load(unsigned long dst, unsigned long src, unsigned long count)
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{
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memcpy((void *)dst, (void *)src, count);
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}
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/*
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* Start the kernel.
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*/
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static inline void
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runkernel(void)
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{
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__asm__ __volatile__(
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"bis %0,%0,$27\n\t"
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"jmp ($27)"
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: /* no outputs: it doesn't even return */
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: "r" (START_ADDR));
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}
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extern char _end;
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#define KERNEL_ORIGIN \
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((((unsigned long)&_end) + 511) & ~511)
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void
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start_kernel(void)
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{
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/*
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* Note that this crufty stuff with static and envval
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* and envbuf is because:
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*
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* 1. Frequently, the stack is short, and we don't want to overrun;
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* 2. Frequently the stack is where we are going to copy the kernel to;
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* 3. A certain SRM console required the GET_ENV output to stack.
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* ??? A comment in the aboot sources indicates that the GET_ENV
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* destination must be quadword aligned. Might this explain the
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* behaviour, rather than requiring output to the stack, which
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* seems rather far-fetched.
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*/
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static long nbytes;
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static char envval[256] __attribute__((aligned(8)));
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static unsigned long initrd_start;
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srm_printk("Linux/AXP bootp loader for Linux " UTS_RELEASE "\n");
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if (INIT_HWRPB->pagesize != 8192) {
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srm_printk("Expected 8kB pages, got %ldkB\n",
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INIT_HWRPB->pagesize >> 10);
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return;
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}
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if (INIT_HWRPB->vptb != (unsigned long) VPTB) {
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srm_printk("Expected vptb at %p, got %p\n",
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VPTB, (void *)INIT_HWRPB->vptb);
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return;
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}
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pal_init();
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/* The initrd must be page-aligned. See below for the
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cause of the magic number 5. */
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initrd_start = ((START_ADDR + 5*KERNEL_SIZE + PAGE_SIZE) |
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(PAGE_SIZE-1)) + 1;
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#ifdef INITRD_IMAGE_SIZE
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srm_printk("Initrd positioned at %#lx\n", initrd_start);
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#endif
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/*
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* Move the stack to a safe place to ensure it won't be
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* overwritten by kernel image.
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*/
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move_stack(initrd_start - PAGE_SIZE);
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nbytes = callback_getenv(ENV_BOOTED_OSFLAGS, envval, sizeof(envval));
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if (nbytes < 0 || nbytes >= sizeof(envval)) {
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nbytes = 0;
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}
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envval[nbytes] = '\0';
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srm_printk("Loading the kernel...'%s'\n", envval);
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/* NOTE: *no* callbacks or printouts from here on out!!! */
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/* This is a hack, as some consoles seem to get virtual 20000000 (ie
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* where the SRM console puts the kernel bootp image) memory
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* overlapping physical memory where the kernel wants to be put,
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* which causes real problems when attempting to copy the former to
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* the latter... :-(
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*
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* So, we first move the kernel virtual-to-physical way above where
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* we physically want the kernel to end up, then copy it from there
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* to its final resting place... ;-}
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*
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* Sigh... */
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#ifdef INITRD_IMAGE_SIZE
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load(initrd_start, KERNEL_ORIGIN+KERNEL_SIZE, INITRD_IMAGE_SIZE);
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#endif
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load(START_ADDR+(4*KERNEL_SIZE), KERNEL_ORIGIN, KERNEL_SIZE);
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load(START_ADDR, START_ADDR+(4*KERNEL_SIZE), KERNEL_SIZE);
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memset((char*)ZERO_PGE, 0, PAGE_SIZE);
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strcpy((char*)ZERO_PGE, envval);
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#ifdef INITRD_IMAGE_SIZE
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((long *)(ZERO_PGE+256))[0] = initrd_start;
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((long *)(ZERO_PGE+256))[1] = INITRD_IMAGE_SIZE;
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#endif
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runkernel();
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}
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