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/*
* FCode boot loader
*/
#include "config.h"
#include "kernel/kernel.h"
#include "libopenbios/bindings.h"
#include "libopenbios/fcode_load.h"
#include "libopenbios/initprogram.h"
#include "libopenbios/sys_info.h"
#include "libc/diskio.h"
#define printf printk
#define debug printk
static int fd;
int
is_fcode(unsigned char *fcode)
{
return (fcode[0] == 0xf0 // start0
|| fcode[0] == 0xf1 // start1
|| fcode[0] == 0xf2 // start2
|| fcode[0] == 0xf3 // start4
|| fcode[0] == 0xfd); // version1
}
int
fcode_load(ihandle_t dev)
{
int retval = -1;
uint8_t fcode_header[8];
unsigned long start, size;
unsigned int offset;
/* Mark the saved-program-state as invalid */
feval("0 state-valid !");
fd = open_ih(dev);
if (fd == -1) {
goto out;
}
for (offset = 0; offset < 16 * 512; offset += 512) {
seek_io(fd, offset);
if (read_io(fd, &fcode_header, sizeof(fcode_header))
!= sizeof(fcode_header)) {
debug("Can't read FCode header from ihandle " FMT_ucellx "\n", dev);
retval = LOADER_NOT_SUPPORT;
goto out;
}
if (is_fcode(fcode_header))
goto found;
}
debug("Not a bootable FCode image\n");
retval = LOADER_NOT_SUPPORT;
goto out;
found:
size = (fcode_header[4] << 24) | (fcode_header[5] << 16) |
(fcode_header[6] << 8) | fcode_header[7];
fword("load-base");
start = POP();
printf("\nLoading FCode image...\n");
seek_io(fd, offset);
if ((size_t)read_io(fd, (void *)start, size) != size) {
printf("Can't read file (size 0x%lx)\n", size);
goto out;
}
debug("Loaded %lu bytes\n", size);
debug("entry point is %#lx\n", start);
// Initialise load-state
PUSH(size);
feval("load-state >ls.file-size !");
feval("fcode load-state >ls.file-type !");
out:
close_io(fd);
return retval;
}
void
fcode_init_program(void)
{
/* Use trampoline context to execute FCode */
PUSH((ucell)&init_fcode_context);
feval("load-state >ls.entry !");
arch_init_program();
feval("-1 state-valid !");
}
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