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minix/kernel/arch/i386/pre_init.c
Tomas Hruby 6c3b981cd6 arch proto.h renamed to arch_proto.h 
- the file moved to the arch include dir
2010-09-15 14:09:36 +00:00

418 lines
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C
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#include "kernel/kernel.h"
#include <minix/minlib.h>
#include <minix/const.h>
/*
* == IMPORTANT ==
* Routines in this file can not use any variable in kernel BSS,
* since before image is extracted, no BSS is allocated.
* So pay attention to any external call (including library call).
*
* */
#include <minix/types.h>
#include <minix/type.h>
#include <minix/com.h>
#include <minix/a.out.h>
#include <machine/partition.h>
#include "../../../boot/image.h"
#include "string.h"
#include "arch_proto.h"
#include "multiboot.h"
/* Granularity used in image file and copying */
#define GRAN 512
#define SECT_CEIL(x) ((((x) - 1) / GRAN + 1) * GRAN)
/* String length used for mb_itoa */
#define ITOA_BUFFER_SIZE 20
/* The a.out headers to pass to kernel.
* Not using struct exec because only using short form */
extern char a_out_headers[];
#define mb_load_phymem(buf, phy, len) \
phys_copy((phy), PTR2PHY(buf), (len))
#define mb_save_phymem(buf, phy, len) \
phys_copy(PTR2PHY(buf), (phy), (len))
FORWARD _PROTOTYPE(void mb_print, (char *str));
PRIVATE void mb_phys_move(u32_t src, u32_t dest, u32_t len)
{
char data[GRAN + 1];
int i;
/* Move upward (start moving from tail), block by block
* len should be aligned to GRAN
*/
if (len % GRAN) {
mb_print("fatal: not aligned phys move");
/* Spin here */
while (1)
;
}
len /= GRAN;
for (i = len - 1; i >= 0; i--) {
mb_load_phymem(data, src + i * GRAN, GRAN);
mb_save_phymem(data, dest + i * GRAN, GRAN);
}
}
PRIVATE void mb_itoa(u32_t val, char * out)
{
char ret[ITOA_BUFFER_SIZE];
int i = ITOA_BUFFER_SIZE - 2;
/* Although there's a library version of itoa(int n),
* we can't use it since that implementation relies on BSS segment
*/
ret[ITOA_BUFFER_SIZE - 2] = '0';
if (val) {
for (; i >= 0; i--) {
char c;
if (val == 0) break;
c = val % 10;
val = val / 10;
c += '0';
ret[i] = c;
}
}
else
i--;
ret[ITOA_BUFFER_SIZE - 1] = 0;
strcpy(out, ret + i + 1);
}
PRIVATE void mb_itox(u32_t val, char *out)
{
char ret[9];
int i = 7;
/* Convert a number to hex string */
ret[7] = '0';
if (val) {
for (; i >= 0; i--) {
char c;
if (val == 0) break;
c = val & 0xF;
val = val >> 4;
if (c > 9)
c += 'A' - 10;
else
c += '0';
ret[i] = c;
}
}
else
i--;
ret[8] = 0;
strcpy(out, ret + i + 1);
}
PRIVATE void mb_put_char(char c, int line, int col)
{
/* Write a char to vga display buffer. */
if (line<MULTIBOOT_CONSOLE_LINES&&col<MULTIBOOT_CONSOLE_COLS)
mb_save_phymem(
&c,
MULTIBOOT_VIDEO_BUFFER
+ line * MULTIBOOT_CONSOLE_COLS * 2
+ col * 2,
1);
}
PRIVATE char mb_get_char(int line, int col)
{
char c;
/* Read a char to from display buffer. */
if (line < MULTIBOOT_CONSOLE_LINES && col < MULTIBOOT_CONSOLE_COLS)
mb_load_phymem(
&c,
MULTIBOOT_VIDEO_BUFFER
+ line * MULTIBOOT_CONSOLE_COLS * 2
+ col * 2,
1);
return c;
}
/* Give non-zero values to avoid them in BSS */
PRIVATE int print_line = 1, print_col = 1;
PRIVATE void mb_cls(void)
{
int i, j;
/* Clear screen */
for (i = 0; i < MULTIBOOT_CONSOLE_LINES; i++ )
for (j = 0; j < MULTIBOOT_CONSOLE_COLS; j++ )
mb_put_char(0, i, j);
print_line = print_col = 0;
}
PRIVATE void mb_scroll_up(int lines)
{
int i, j;
for (i = 0; i < MULTIBOOT_CONSOLE_LINES - lines; i++ ) {
for (j = 0; j < MULTIBOOT_CONSOLE_COLS; j++ )
mb_put_char(mb_get_char(i + lines, j), i, j);
}
print_line-= lines;
}
PRIVATE void mb_print(char *str)
{
while (*str) {
if (*str == '\n') {
str++;
print_line++;
print_col = 0;
continue;
}
mb_put_char(*str++, print_line, print_col++);
if (print_col >= MULTIBOOT_CONSOLE_COLS) {
print_line++;
print_col = 0;
}
while (print_line >= MULTIBOOT_CONSOLE_LINES)
mb_scroll_up(1);
}
}
PRIVATE void mb_print_hex(u32_t value)
{
int i;
char c;
char out[9] = "00000000";
/* Print a hex value */
for (i = 7; i >= 0; i--) {
c = value % 0x10;
value /= 0x10;
if (c < 10)
c += '0';
else
c += 'A'-10;
out[i] = c;
}
mb_print(out);
}
PRIVATE int mb_set_param(char *name, char *value)
{
char *p = multiboot_param_buf;
char *q;
int namelen = strlen(name);
int valuelen = strlen(value);
/* Delete the item if already exists */
while (*p) {
if (strncmp(p, name, namelen) == 0 && p[namelen] == '=') {
q = p;
while (*q) q++;
for (q++;
q < multiboot_param_buf + MULTIBOOT_PARAM_BUF_SIZE;
q++, p++)
*p = *q;
break;
}
while (*p++)
;
p++;
}
for (p = multiboot_param_buf;
p < multiboot_param_buf + MULTIBOOT_PARAM_BUF_SIZE
&& (*p || *(p + 1));
p++)
;
if (p > multiboot_param_buf) p++;
/* Make sure there's enough space for the new parameter */
if (p + namelen + valuelen + 3
> multiboot_param_buf + MULTIBOOT_PARAM_BUF_SIZE)
return -1;
strcpy(p, name);
p[namelen] = '=';
strcpy(p + namelen + 1, value);
p[namelen + valuelen + 1] = 0;
p[namelen + valuelen + 2] = 0;
return 0;
}
PRIVATE void get_parameters(multiboot_info_t *mbi)
{
char mem_value[40], temp[ITOA_BUFFER_SIZE];
int i, r, processor;
int dev;
int ctrlr;
int disk, prim, sub;
int var_i,value_i;
char *p;
const static int dev_cNd0[] = { 0x0300, 0x0800, 0x0A00, 0x0C00, 0x1000 };
static char mb_cmd_buff[GRAN] = "add some value to avoid me in BSS";
static char var[GRAN] = "add some value to avoid me in BSS";
static char value[GRAN] = "add some value to avoid me in BSS";
for (i = 0; i < MULTIBOOT_PARAM_BUF_SIZE; i++)
multiboot_param_buf[i] = 0;
if (mbi->flags & MULTIBOOT_INFO_BOOTDEV) {
sub = 0xff;
disk = ((mbi->boot_device&0xff000000) >> 24)-0x80;
prim = (mbi->boot_device&0xff0000) == 0xff0000 ?
0 : (mbi->boot_device & 0xff0000) >> 16;
ctrlr = 0;
dev = dev_cNd0[ctrlr];
/* Determine the value of rootdev */
if ((mbi->boot_device & 0xff00) == 0xff00) {
dev += disk * (NR_PARTITIONS + 1) + (prim + 1);
} else {
sub = (mbi->boot_device & 0xff00) >> 8;
dev += 0x80
+ (disk * NR_PARTITIONS + prim) * NR_PARTITIONS
+ sub;
}
mb_itoa(dev, temp);
mb_set_param("rootdev", temp);
mb_set_param("ramimagedev", temp);
}
mb_set_param("ramsize", "0");
mb_set_param("hz", "60");
processor = getprocessor();
if (processor == 1586) processor = 686;
mb_itoa(processor, temp);
mb_set_param("processor", temp);
mb_set_param("bus", "at");
mb_set_param("video", "ega");
mb_set_param("chrome", "color");
if (mbi->flags & MULTIBOOT_INFO_MEMORY)
{
strcpy(mem_value, "800:");
mb_itox(
mbi->mem_lower * 1024 > MULTIBOOT_LOWER_MEM_MAX ?
MULTIBOOT_LOWER_MEM_MAX : mbi->mem_lower * 1024,
temp);
strcat(mem_value, temp);
strcat(mem_value, ",100000:");
mb_itox(mbi->mem_upper * 1024, temp);
strcat(mem_value, temp);
mb_set_param("memory", mem_value);
}
/* FIXME: this is dummy value,
* we can't get real image file name from multiboot */
mb_set_param("image", "boot/image_latest");
if (mbi->flags&MULTIBOOT_INFO_CMDLINE) {
/* Override values with cmdline argument */
p = mb_cmd_buff;
mb_load_phymem(mb_cmd_buff, mbi->cmdline, GRAN);
while (*p) {
var_i = 0;
value_i = 0;
while (*p == ' ') p++;
if (!*p) break;
while (*p && *p != '=' && var_i < GRAN - 1)
var[var_i++] = *p++ ;
var[var_i] = 0;
p++; /* skip '=' */
while (*p && *p != ' ' && value_i < GRAN - 1)
value[value_i++] = *p++ ;
value[value_i] = 0;
mb_set_param(var, value);
}
}
}
PRIVATE void mb_extract_image(void)
{
int i;
u32_t text_addr[NR_BOOT_PROCS];
u32_t imghdr_addr = MULTIBOOT_LOAD_ADDRESS;
int off_sum = 0;
struct exec *aout_hdr;
int empty, clear_size, j;
u32_t p;
/* Extract the image to align segments and clear up BSS
*/
for (i = 0; i < LAST_SPECIAL_PROC_NR + 2; i++) {
aout_hdr = (struct exec *) (a_out_headers + A_MINHDR * i);
mb_load_phymem(aout_hdr, imghdr_addr + IM_NAME_MAX + 1, A_MINHDR);
text_addr[i] = imghdr_addr + GRAN;
if (aout_hdr->a_flags & A_SEP) {
off_sum += CLICK_CEIL(aout_hdr->a_total)
- SECT_CEIL(aout_hdr->a_data)
+ CLICK_CEIL(aout_hdr->a_text)
- SECT_CEIL(aout_hdr->a_text)
- GRAN;
imghdr_addr += SECT_CEIL(aout_hdr->a_text)
+ SECT_CEIL(aout_hdr->a_data)
+ GRAN;
} else {
off_sum += CLICK_CEIL(aout_hdr->a_total)
- SECT_CEIL(aout_hdr->a_data + aout_hdr->a_text)
- GRAN;
imghdr_addr += SECT_CEIL(aout_hdr->a_text + aout_hdr->a_data)
+ GRAN;
}
}
for (i = LAST_SPECIAL_PROC_NR + 1; i >= 0;i--) {
struct exec * aout_hdr = (struct exec *) (a_out_headers + A_MINHDR * i);
if (aout_hdr->a_flags & A_SEP)
off_sum -= CLICK_CEIL(aout_hdr->a_total)
- SECT_CEIL(aout_hdr->a_data)
+ CLICK_CEIL(aout_hdr->a_text)
- SECT_CEIL(aout_hdr->a_text)
- GRAN;
else
off_sum -= CLICK_CEIL(aout_hdr->a_total)
- SECT_CEIL(aout_hdr->a_data + aout_hdr->a_text)
- GRAN;
if (i > 0) { /* if not kernel */
if (aout_hdr->a_flags & A_SEP) {
mb_phys_move(text_addr[i], text_addr[i] + off_sum,
SECT_CEIL(aout_hdr->a_text));
mb_phys_move(text_addr[i] + SECT_CEIL(aout_hdr->a_text),
text_addr[i] + off_sum + CLICK_CEIL(aout_hdr->a_text),
SECT_CEIL(aout_hdr->a_data));
} else {
mb_phys_move(text_addr[i], text_addr[i] + off_sum,
SECT_CEIL(aout_hdr->a_text + aout_hdr->a_data));
}
}
aout_hdr->a_syms = text_addr[i] + off_sum;
/* Clear out for expanded text, BSS and stack */
empty = 0;
if (aout_hdr->a_flags & A_SEP) {
p = text_addr[i] + off_sum
+ CLICK_CEIL(aout_hdr->a_text)
+ aout_hdr->a_data;
clear_size = CLICK_CEIL(aout_hdr->a_total) - aout_hdr->a_data;
} else {
p = text_addr[i] + off_sum
+ aout_hdr->a_text
+ aout_hdr->a_data;
clear_size = CLICK_CEIL(aout_hdr->a_total)
- aout_hdr->a_data
- aout_hdr->a_text;
}
/* FIXME: use faster function */
for (j = 0; j < clear_size; j++)
mb_save_phymem(&empty, p + j, 1);
}
}
PUBLIC u32_t pre_init(u32_t ebx)
{
multiboot_info_t mbi;
/* Do pre-initialization for multiboot, returning physical address of
* a_out_headers
*/
mb_cls();
mb_print("\nMINIX booting... ");
mb_load_phymem(&mbi, ebx, sizeof(mbi));
get_parameters(&mbi);
mb_print("\nLoading image... ");
mb_extract_image();
return PTR2PHY(a_out_headers);
}
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