mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 10:04:12 +08:00
e31cf2f4ca
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>
191 lines
4.2 KiB
C
191 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* arch/alpha/boot/main.c
|
|
*
|
|
* Copyright (C) 1994, 1995 Linus Torvalds
|
|
*
|
|
* This file is the bootloader for the Linux/AXP kernel
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/string.h>
|
|
#include <generated/utsrelease.h>
|
|
#include <linux/mm.h>
|
|
|
|
#include <asm/console.h>
|
|
#include <asm/hwrpb.h>
|
|
|
|
#include <stdarg.h>
|
|
|
|
#include "ksize.h"
|
|
|
|
extern unsigned long switch_to_osf_pal(unsigned long nr,
|
|
struct pcb_struct * pcb_va, struct pcb_struct * pcb_pa,
|
|
unsigned long *vptb);
|
|
struct hwrpb_struct *hwrpb = INIT_HWRPB;
|
|
static struct pcb_struct pcb_va[1];
|
|
|
|
/*
|
|
* Find a physical address of a virtual object..
|
|
*
|
|
* This is easy using the virtual page table address.
|
|
*/
|
|
|
|
static inline void *
|
|
find_pa(unsigned long *vptb, void *ptr)
|
|
{
|
|
unsigned long address = (unsigned long) ptr;
|
|
unsigned long result;
|
|
|
|
result = vptb[address >> 13];
|
|
result >>= 32;
|
|
result <<= 13;
|
|
result |= address & 0x1fff;
|
|
return (void *) result;
|
|
}
|
|
|
|
/*
|
|
* This function moves into OSF/1 pal-code, and has a temporary
|
|
* PCB for that. The kernel proper should replace this PCB with
|
|
* the real one as soon as possible.
|
|
*
|
|
* The page table muckery in here depends on the fact that the boot
|
|
* code has the L1 page table identity-map itself in the second PTE
|
|
* in the L1 page table. Thus the L1-page is virtually addressable
|
|
* itself (through three levels) at virtual address 0x200802000.
|
|
*/
|
|
|
|
#define VPTB ((unsigned long *) 0x200000000)
|
|
#define L1 ((unsigned long *) 0x200802000)
|
|
|
|
void
|
|
pal_init(void)
|
|
{
|
|
unsigned long i, rev;
|
|
struct percpu_struct * percpu;
|
|
struct pcb_struct * pcb_pa;
|
|
|
|
/* Create the dummy PCB. */
|
|
pcb_va->ksp = 0;
|
|
pcb_va->usp = 0;
|
|
pcb_va->ptbr = L1[1] >> 32;
|
|
pcb_va->asn = 0;
|
|
pcb_va->pcc = 0;
|
|
pcb_va->unique = 0;
|
|
pcb_va->flags = 1;
|
|
pcb_va->res1 = 0;
|
|
pcb_va->res2 = 0;
|
|
pcb_pa = find_pa(VPTB, pcb_va);
|
|
|
|
/*
|
|
* a0 = 2 (OSF)
|
|
* a1 = return address, but we give the asm the vaddr of the PCB
|
|
* a2 = physical addr of PCB
|
|
* a3 = new virtual page table pointer
|
|
* a4 = KSP (but the asm sets it)
|
|
*/
|
|
srm_printk("Switching to OSF PAL-code .. ");
|
|
|
|
i = switch_to_osf_pal(2, pcb_va, pcb_pa, VPTB);
|
|
if (i) {
|
|
srm_printk("failed, code %ld\n", i);
|
|
__halt();
|
|
}
|
|
|
|
percpu = (struct percpu_struct *)
|
|
(INIT_HWRPB->processor_offset + (unsigned long) INIT_HWRPB);
|
|
rev = percpu->pal_revision = percpu->palcode_avail[2];
|
|
|
|
srm_printk("Ok (rev %lx)\n", rev);
|
|
|
|
tbia(); /* do it directly in case we are SMP */
|
|
}
|
|
|
|
static inline long openboot(void)
|
|
{
|
|
char bootdev[256];
|
|
long result;
|
|
|
|
result = callback_getenv(ENV_BOOTED_DEV, bootdev, 255);
|
|
if (result < 0)
|
|
return result;
|
|
return callback_open(bootdev, result & 255);
|
|
}
|
|
|
|
static inline long close(long dev)
|
|
{
|
|
return callback_close(dev);
|
|
}
|
|
|
|
static inline long load(long dev, unsigned long addr, unsigned long count)
|
|
{
|
|
char bootfile[256];
|
|
extern char _end;
|
|
long result, boot_size = &_end - (char *) BOOT_ADDR;
|
|
|
|
result = callback_getenv(ENV_BOOTED_FILE, bootfile, 255);
|
|
if (result < 0)
|
|
return result;
|
|
result &= 255;
|
|
bootfile[result] = '\0';
|
|
if (result)
|
|
srm_printk("Boot file specification (%s) not implemented\n",
|
|
bootfile);
|
|
return callback_read(dev, count, (void *)addr, boot_size/512 + 1);
|
|
}
|
|
|
|
/*
|
|
* Start the kernel.
|
|
*/
|
|
static void runkernel(void)
|
|
{
|
|
__asm__ __volatile__(
|
|
"bis %1,%1,$30\n\t"
|
|
"bis %0,%0,$26\n\t"
|
|
"ret ($26)"
|
|
: /* no outputs: it doesn't even return */
|
|
: "r" (START_ADDR),
|
|
"r" (PAGE_SIZE + INIT_STACK));
|
|
}
|
|
|
|
void start_kernel(void)
|
|
{
|
|
long i;
|
|
long dev;
|
|
int nbytes;
|
|
char envval[256];
|
|
|
|
srm_printk("Linux/AXP bootloader for Linux " UTS_RELEASE "\n");
|
|
if (INIT_HWRPB->pagesize != 8192) {
|
|
srm_printk("Expected 8kB pages, got %ldkB\n", INIT_HWRPB->pagesize >> 10);
|
|
return;
|
|
}
|
|
pal_init();
|
|
dev = openboot();
|
|
if (dev < 0) {
|
|
srm_printk("Unable to open boot device: %016lx\n", dev);
|
|
return;
|
|
}
|
|
dev &= 0xffffffff;
|
|
srm_printk("Loading vmlinux ...");
|
|
i = load(dev, START_ADDR, KERNEL_SIZE);
|
|
close(dev);
|
|
if (i != KERNEL_SIZE) {
|
|
srm_printk("Failed (%lx)\n", i);
|
|
return;
|
|
}
|
|
|
|
nbytes = callback_getenv(ENV_BOOTED_OSFLAGS, envval, sizeof(envval));
|
|
if (nbytes < 0) {
|
|
nbytes = 0;
|
|
}
|
|
envval[nbytes] = '\0';
|
|
strcpy((char*)ZERO_PGE, envval);
|
|
|
|
srm_printk(" Ok\nNow booting the kernel\n");
|
|
runkernel();
|
|
for (i = 0 ; i < 0x100000000 ; i++)
|
|
/* nothing */;
|
|
__halt();
|
|
}
|