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utils.c
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utils.c
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#include <linux/kernel.h>
#include "hwrpb.h"
#include <linux/version.h>
#include "system.h"
#include "string.h"
#include <stdarg.h>
#include <errno.h>
#include "aboot.h"
#include "cons.h"
unsigned long free_mem_ptr = 0;
int printf(const char *fmt, ...)
{
static char buf[1024];
va_list args;
long len, num_lf;
char *src, *dst;
va_start(args, fmt);
len = vsprintf(buf, fmt, args);
va_end(args);
/* count number of linefeeds in string: */
num_lf = 0;
for (src = buf; *src; ++src) {
if (*src == '\n') {
++num_lf;
}
}
if (num_lf) {
/* expand each linefeed into carriage-return/linefeed: */
for (dst = src + num_lf; src >= buf; ) {
if (*src == '\n') {
*dst-- = '\r';
}
*dst-- = *src--;
}
}
return cons_puts(buf, len + num_lf);
}
/*
* Find a physical address of a virtual object..
*
* This is easy using the virtual page table address.
*/
struct pcb_struct *find_pa(unsigned long *vptb, struct pcb_struct *pcb)
{
unsigned long address = (unsigned long) pcb;
unsigned long result;
result = vptb[address >> 13];
result >>= 32;
result <<= 13;
result |= address & 0x1fff;
return (struct pcb_struct *) 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.
*
* As we don't want it there anyway, we also move the L1 self-map
* up as high as we can, so that the last entry in the L1 page table
* maps the page tables.
*
* As a result, the OSF/1 pal-code will instead use a virtual page table
* map located at 0xffffffe00000000.
*/
#define pcb_va ((struct pcb_struct *) 0x20000000)
#define old_vptb (0x0000000200000000UL)
#define new_vptb (0xfffffffe00000000UL)
void pal_init(void)
{
unsigned long i, rev, sum;
unsigned long *L1, *l;
struct percpu_struct * percpu;
struct pcb_struct * pcb_pa;
/* Find the level 1 page table and duplicate it in high memory */
L1 = (unsigned long *) 0x200802000UL; /* (1<<33 | 1<<23 | 1<<13) */
L1[1023] = L1[1];
percpu = (struct percpu_struct *) (INIT_HWRPB->processor_offset
+ (unsigned long) INIT_HWRPB),
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_pa = find_pa((unsigned long *) old_vptb, pcb_va);
printf("aboot: switching to OSF/1 PALcode");
/*
* a0 = 2 (OSF)
* a1 = return address, but we give the asm the virtual addr of the PCB
* a2 = physical addr of PCB
* a3 = new virtual page table pointer
* a4 = KSP (but we give it 0, asm sets it)
*/
i = switch_to_osf_pal(
2,
pcb_va,
pcb_pa,
new_vptb,
0);
if (i) {
printf("---failed, code %ld\n", i);
halt();
}
rev = percpu->pal_revision = percpu->palcode_avail[2];
INIT_HWRPB->vptb = new_vptb;
/* update checksum: */
sum = 0;
for (l = (unsigned long *) INIT_HWRPB; l < (unsigned long *) &INIT_HWRPB->chksum; ++l)
sum += *l;
INIT_HWRPB->chksum = sum;
printf(" version %ld.%ld\n", (rev >> 8) & 0xff, rev & 0xff);
/* remove the old virtual page-table mapping */
L1[1] = 0;
tbia();
}
int check_memory(unsigned long start, unsigned long size)
{
unsigned long phys_start, start_pfn, end_pfn;
struct memclust_struct *cluster;
struct memdesc_struct *memdesc;
int i;
/*
* Get the physical address start.
* If 43-bit superpage is being used (VA<63:41> = 0x7ffffe)
* then the "correct" translation across all implementations is to
* sign extend the VA from bit 40. Othewise, assume it's already a
* physical address.
*/
phys_start = start;
if (((long)phys_start >> 41) == -2)
phys_start = (long)((start) << (64-41)) >> (64-41);
start_pfn = phys_start >> PAGE_SHIFT;
end_pfn = (phys_start + size - 1) >> PAGE_SHIFT;
memdesc = (struct memdesc_struct *)
(INIT_HWRPB->mddt_offset + (unsigned long) INIT_HWRPB);
for (cluster = memdesc->cluster, i = 0;
i < memdesc->numclusters;
i++, cluster++) {
if ((cluster->start_pfn > end_pfn) ||
((cluster->start_pfn + cluster->numpages) <= start_pfn))
continue; /* no overlap */
/*
* This cluster overlaps the memory we're checking, check
* the usage:
* bit 0 is console/PAL reserved
* bit 1 is non-volatile
* If either is set, it's a problem, return -EBUSY
*/
if (cluster->usage & 3)
return -EBUSY; /* reserved */
/*
* It's not reserved, take it out of what we're checking
*/
if (cluster->start_pfn <= end_pfn)
end_pfn = cluster->start_pfn - 1;
if ((cluster->start_pfn + cluster->numpages) > start_pfn)
start_pfn = cluster->start_pfn + cluster->numpages;
if (end_pfn < start_pfn)
return 0; /* all found, ok */
}
/* no conflict, but not all memory found */
return -ENOMEM;
}
unsigned long memory_end(void)
{
int i;
unsigned long high = 0;
struct memclust_struct *cluster;
struct memdesc_struct *memdesc;
memdesc = (struct memdesc_struct *)
(INIT_HWRPB->mddt_offset + (unsigned long) INIT_HWRPB);
cluster = memdesc->cluster;
for (i = memdesc->numclusters; i > 0; i--, cluster++) {
unsigned long tmp;
if (cluster->usage != 0) {
/* this is a PAL or NVRAM cluster (not for the OS) */
continue;
}
tmp = (cluster->start_pfn + cluster->numpages) << page_shift;
if (tmp > high) {
high = tmp;
}
}
return page_offset + high;
}
static void error(char *x)
{
printf("%s\n", x);
_longjmp(jump_buffer, 1);
}
void unzip_error(char *x)
{
printf("\nunzip: ");
error(x);
}
void *malloc(size_t size)
{
if (!free_mem_ptr) {
free_mem_ptr = memory_end();
}
free_mem_ptr = (free_mem_ptr - size) & ~(sizeof(long) - 1);
if ((char*) free_mem_ptr <= dest_addr + INIT_HWRPB->pagesize) {
error("\nout of memory");
}
return (void*) free_mem_ptr;
}
void free(void *where)
{
/* don't care */
}
void
getline (char *buf, int maxlen)
{
int len=0;
char c;
do {
c = cons_getchar();
switch (c) {
case 0:
case 10:
case 13:
break;
case 8:
case 127:
if (len > 0) {
--len;
cons_putchar(8);
cons_putchar(' ');
cons_putchar(8);
}
break;
default:
if (len < maxlen-1 && c >= ' ') {
buf[len] = c;
len++;
cons_putchar(c);
}
break;
}
} while (c != 13 && c != 10);
buf[len] = 0;
}