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
bootp.c
/*
* arch/alpha/boot/bootp.c
*
* Copyright (C) 1997 Jay Estabrook
*
* This file is used for creating a bootp file for the Linux/AXP kernel
*
* based significantly on the arch/alpha/boot/main.c of Linus Torvalds
*/
#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 <asm/io.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);
extern void move_stack(unsigned long new_stack);
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 void
load(unsigned long dst, unsigned long src, unsigned long count)
{
memcpy((void *)dst, (void *)src, count);
}
/*
* Start the kernel.
*/
static inline void
runkernel(void)
{
__asm__ __volatile__(
"bis %0,%0,$27\n\t"
"jmp ($27)"
: /* no outputs: it doesn't even return */
: "r" (START_ADDR));
}
extern char _end;
#define KERNEL_ORIGIN \
((((unsigned long)&_end) + 511) & ~511)
void
start_kernel(void)
{
/*
* Note that this crufty stuff with static and envval
* and envbuf is because:
*
* 1. Frequently, the stack is short, and we don't want to overrun;
* 2. Frequently the stack is where we are going to copy the kernel to;
* 3. A certain SRM console required the GET_ENV output to stack.
* ??? A comment in the aboot sources indicates that the GET_ENV
* destination must be quadword aligned. Might this explain the
* behaviour, rather than requiring output to the stack, which
* seems rather far-fetched.
*/
static long nbytes;
static char envval[256] __attribute__((aligned(8)));
static unsigned long initrd_start;
srm_printk("Linux/AXP bootp loader for Linux " UTS_RELEASE "\n");
if (INIT_HWRPB->pagesize != 8192) {
srm_printk("Expected 8kB pages, got %ldkB\n",
INIT_HWRPB->pagesize >> 10);
return;
}
if (INIT_HWRPB->vptb != (unsigned long) VPTB) {
srm_printk("Expected vptb at %p, got %p\n",
VPTB, (void *)INIT_HWRPB->vptb);
return;
}
pal_init();
/* The initrd must be page-aligned. See below for the
cause of the magic number 5. */
initrd_start = ((START_ADDR + 5*KERNEL_SIZE + PAGE_SIZE) |
(PAGE_SIZE-1)) + 1;
#ifdef INITRD_IMAGE_SIZE
srm_printk("Initrd positioned at %#lx\n", initrd_start);
#endif
/*
* Move the stack to a safe place to ensure it won't be
* overwritten by kernel image.
*/
move_stack(initrd_start - PAGE_SIZE);
nbytes = callback_getenv(ENV_BOOTED_OSFLAGS, envval, sizeof(envval));
if (nbytes < 0 || nbytes >= sizeof(envval)) {
nbytes = 0;
}
envval[nbytes] = '\0';
srm_printk("Loading the kernel...'%s'\n", envval);
/* NOTE: *no* callbacks or printouts from here on out!!! */
/* This is a hack, as some consoles seem to get virtual 20000000 (ie
* where the SRM console puts the kernel bootp image) memory
* overlapping physical memory where the kernel wants to be put,
* which causes real problems when attempting to copy the former to
* the latter... :-(
*
* So, we first move the kernel virtual-to-physical way above where
* we physically want the kernel to end up, then copy it from there
* to its final resting place... ;-}
*
* Sigh... */
#ifdef INITRD_IMAGE_SIZE
load(initrd_start, KERNEL_ORIGIN+KERNEL_SIZE, INITRD_IMAGE_SIZE);
#endif
load(START_ADDR+(4*KERNEL_SIZE), KERNEL_ORIGIN, KERNEL_SIZE);
load(START_ADDR, START_ADDR+(4*KERNEL_SIZE), KERNEL_SIZE);
memset((char*)ZERO_PGE, 0, PAGE_SIZE);
strcpy((char*)ZERO_PGE, envval);
#ifdef INITRD_IMAGE_SIZE
((long *)(ZERO_PGE+256))[0] = initrd_start;
((long *)(ZERO_PGE+256))[1] = INITRD_IMAGE_SIZE;
#endif
runkernel();
}
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