mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Meelis Roos](/assets/img/avatar_default.png)
In current 2.6.23-rc1+git, make bootimage gives the following warning while compiling arch/alpha/boot/main.c. The patch below fixes the warning by casting callback argument explicitly to void*. The original value comes from START_ADDR macro and is clearly numeric so only cast it for the callback. CC arch/alpha/boot/main.o arch/alpha/boot/main.c: In function 'load': arch/alpha/boot/main.c:135: warning: passing argument 3 of 'callback_read' makes pointer from integer without a cast Signed-off-by: Meelis Roos <mroos@linux.ee> Cc: Jay Estabrook <jay.estabrook@hp.com> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
191 lines
4.3 KiB
C
191 lines
4.3 KiB
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/string.h>
|
|
#include <linux/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();
|
|
}
|