Imbus/xv6-riscv-kernel
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spacing fixes: no tabs, 2-space indents (for rtm)

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rsc 2006-09-06 17:04:06 +00:00
parent 45854caa93
commit a650c606fe
33 changed files with 913 additions and 905 deletions
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106
bootmain.c
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@ -11,10 +11,10 @@
* be stored in the first sector of the disk.
*
* * The 2nd sector onward holds the kernel image.
*
*
* * The kernel image must be in ELF format.
*
* BOOT UP STEPS
* BOOT UP STEPS
* * when the CPU boots it loads the BIOS into memory and executes it
*
* * the BIOS intializes devices, sets of the interrupt routines, and
@ -30,8 +30,8 @@
* * cmain() in this file takes over, reads in the kernel and jumps to it.
**********************************************************************/
#define SECTSIZE 512
#define ELFHDR ((struct elfhdr *) 0x10000) // scratch space
#define SECTSIZE 512
#define ELFHDR ((struct elfhdr *) 0x10000) // scratch space
void readsect(void*, uint);
void readseg(uint, uint, uint);
@ -39,30 +39,30 @@ void readseg(uint, uint, uint);
void
cmain(void)
{
struct proghdr *ph, *eph;
struct proghdr *ph, *eph;
// read 1st page off disk
readseg((uint) ELFHDR, SECTSIZE*8, 0);
// read 1st page off disk
readseg((uint) ELFHDR, SECTSIZE*8, 0);
// is this a valid ELF?
if (ELFHDR->magic != ELF_MAGIC)
goto bad;
// is this a valid ELF?
if (ELFHDR->magic != ELF_MAGIC)
goto bad;
// load each program segment (ignores ph flags)
ph = (struct proghdr *) ((uchar *) ELFHDR + ELFHDR->phoff);
eph = ph + ELFHDR->phnum;
for (; ph < eph; ph++)
readseg(ph->va, ph->memsz, ph->offset);
// load each program segment (ignores ph flags)
ph = (struct proghdr *) ((uchar *) ELFHDR + ELFHDR->phoff);
eph = ph + ELFHDR->phnum;
for (; ph < eph; ph++)
readseg(ph->va, ph->memsz, ph->offset);
// call the entry point from the ELF header
// note: does not return!
((void (*)(void)) (ELFHDR->entry & 0xFFFFFF))();
// call the entry point from the ELF header
// note: does not return!
((void (*)(void)) (ELFHDR->entry & 0xFFFFFF))();
bad:
outw(0x8A00, 0x8A00);
outw(0x8A00, 0x8E00);
while(1)
/* do nothing */;
outw(0x8A00, 0x8A00);
outw(0x8A00, 0x8E00);
while(1)
/* do nothing */;
}
// Read 'count' bytes at 'offset' from kernel into virtual address 'va'.
@ -70,52 +70,52 @@ bad:
void
readseg(uint va, uint count, uint offset)
{
uint end_va;
uint end_va;
va &= 0xFFFFFF;
end_va = va + count;
// round down to sector boundary
va &= ~(SECTSIZE - 1);
va &= 0xFFFFFF;
end_va = va + count;
// round down to sector boundary
va &= ~(SECTSIZE - 1);
// translate from bytes to sectors, and kernel starts at sector 1
offset = (offset / SECTSIZE) + 1;
// translate from bytes to sectors, and kernel starts at sector 1
offset = (offset / SECTSIZE) + 1;
// If this is too slow, we could read lots of sectors at a time.
// We'd write more to memory than asked, but it doesn't matter --
// we load in increasing order.
while (va < end_va) {
readsect((uchar*) va, offset);
va += SECTSIZE;
offset++;
}
// If this is too slow, we could read lots of sectors at a time.
// We'd write more to memory than asked, but it doesn't matter --
// we load in increasing order.
while (va < end_va) {
readsect((uchar*) va, offset);
va += SECTSIZE;
offset++;
}
}
void
waitdisk(void)
{
// wait for disk reaady
while ((inb(0x1F7) & 0xC0) != 0x40)
/* do nothing */;
// wait for disk reaady
while ((inb(0x1F7) & 0xC0) != 0x40)
/* do nothing */;
}
void
readsect(void *dst, uint offset)
{
// wait for disk to be ready
waitdisk();
// wait for disk to be ready
waitdisk();
outb(0x1F2, 1); // count = 1
outb(0x1F3, offset);
outb(0x1F4, offset >> 8);
outb(0x1F5, offset >> 16);
outb(0x1F6, (offset >> 24) | 0xE0);
outb(0x1F7, 0x20); // cmd 0x20 - read sectors
outb(0x1F2, 1); // count = 1
outb(0x1F3, offset);
outb(0x1F4, offset >> 8);
outb(0x1F5, offset >> 16);
outb(0x1F6, (offset >> 24) | 0xE0);
outb(0x1F7, 0x20); // cmd 0x20 - read sectors
// wait for disk to be ready
waitdisk();
// wait for disk to be ready
waitdisk();
// read a sector
insl(0x1F0, dst, SECTSIZE/4);
// read a sector
insl(0x1F0, dst, SECTSIZE/4);
}