Revision 140d0b2108faebc77c6523296e211e509cb9f5f9 authored by Linus Torvalds on 05 August 2011, 05:35:59 UTC, committed by Linus Torvalds on 05 August 2011, 05:35:59 UTC
This isn't really critical any more, since other patches (commit 298507d4d2cf: "shm: optimize exit_shm()") have caused us to not actually need to touch the rw_mutex unless there are actual shm segments associated with the namespace, but we really should do tne shm_init_ns() earlier than we do now. This, together with commit 288d5abec831 ("Boot up with usermodehelper disabled") will mean that we really do initialize the initial ipc namespace data structure before we run any tasks. Tested-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 24f0eed
main.c
/*
* 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/system.h>
#include <asm/console.h>
#include <asm/hwrpb.h>
#include <asm/pgtable.h>
#include <stdarg.h>
#include "ksize.h"
extern int vsprintf(char *, const char *, va_list);
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();
}
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