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More BIOS text display functionality

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This commit is contained in:
Thomas Oltmann 2026-02-21 16:45:39 +01:00
parent 37f53699ff
commit 87ab2b0295
5 changed files with 81 additions and 48 deletions
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2
run-dnsmasq.sh Executable file
View file

@ -0,0 +1,2 @@
#!/bin/sh
dnsmasq -u "$USER" --conf-file=dnsmasq.conf "$@"

35
src/bios.S
View file

@ -86,30 +86,31 @@ bios_func: push %ebp
PROT16
REAL
mov 8+4(%ebp), %edi
mov 0(%edi), %ax
mov 2(%edi), %cx
mov 4(%edi), %dx
mov 6(%edi), %bx
mov 8(%edi), %bp
mov 10(%edi), %si
mov 12(%edi), %di
mov %ds:8+4(%ebp), %edi
mov 0(%edi), %eax
mov 4(%edi), %ecx
mov 8(%edi), %edx
mov 12(%edi), %ebx
mov 16(%edi), %ebp
mov 20(%edi), %esi
mov 24(%edi), %edi
// This instruction will get written at runtime
_bf_int: .byte 0xCD, 0 // INT imm8
push $0
pushf
push %di
// FIXME broken BP
push %edi
mov 8+4(%ebp), %edi
mov %ax, 0(%edi)
mov %cx, 2(%edi)
mov %dx, 4(%edi)
mov %bx, 6(%edi)
mov %bp, 8(%edi)
mov %si, 10(%edi)
pop %ax
mov %ax, 12(%edi)
mov %eax, 0(%edi)
mov %ecx, 4(%edi)
mov %edx, 8(%edi)
mov %ebx, 12(%edi)
mov %ebp, 16(%edi)
mov %esi, 20(%edi)
pop %eax
mov %eax, 24(%edi)
PROT
PROT32

82
src/main.c
View file

@ -49,7 +49,49 @@ struct vesa_info {
uint8_t reserved[492];
};
extern uint16_t bios_func(uint8_t inum, uint16_t reg[]);
extern uint16_t bios_func(uint8_t inum, uint32_t reg[]);
void
blank_screen(uint16_t attr)
{
uint32_t reg[7];
reg[0] = (0x06 << 8);
reg[1] = 0;
reg[2] = 0xFFFF;
reg[3] = attr << 8;
reg[4] = 0;
reg[5] = 0;
reg[6] = 0;
bios_func(0x10, reg);
}
void
move_cursor(uint8_t row, uint8_t col)
{
uint32_t reg[7];
reg[0] = (0x02 << 8);
reg[1] = 0;
reg[2] = (row << 8) | col;
reg[3] = 0;
reg[4] = 0;
reg[5] = 0;
reg[6] = 0;
bios_func(0x10, reg);
}
void
display_string(uint16_t attr, const char *str)
{
uint32_t reg[7];
reg[0] = (0x13 << 8) | 0x01;
reg[1] = strlen(str);
reg[2] = 0xFFFF;
reg[3] = attr;
reg[4] = (uint32_t)str;
reg[5] = 0;
reg[6] = 0;
bios_func(0x10, reg);
}
#define PG_PRESENT 0x001
#define PG_WRITE 0x002
@ -76,16 +118,19 @@ pg_setup()
void
main()
{
bios_write("Netboot via fernlader v2 ...\r\n");
//blank_screen(0x10);
//move_cursor(0, 0);
display_string(0x14, "Netboot via fernlader v2 ...\r\n");
bios_write("Going well ...\r\n");
memcpy(bootboot.magic, BOOTBOOT_MAGIC, sizeof bootboot.magic);
bootboot.size = 128;
bootboot.protocol = PROTOCOL_MINIMAL | LOADER_BIOS;
bootboot.numcores = 1;
bios_write("init\r\n");
display_string(0x0E, "init\r\n");
struct e820_entry *end = bios_getmap(memmap);
bios_write("karlos\r\n");
display_string(0x0E, "karlos\r\n");
for (int i = 0; ; i++) {
if (&memmap[i] >= end) break;
char buf[2];
@ -97,33 +142,7 @@ main()
pg_setup();
#if 0
char foo[24];
bios_write("bios_func():\r\n");
uint32_t reg[6];
reg[0] = 0xE820;
reg[1] = 24;
reg[2] = 0x534D4150;
reg[3] = 0;
reg[4] = (uint32_t)&foo;
reg[5] = 0;
uint16_t flags = bios_func(0x15, reg);
const char *hex_digits = "0123456789ABCDEF";
char buf[100];
buf[0] = hex_digits[(flags >> 12) & 0xF];
buf[1] = hex_digits[(flags >> 8) & 0xF];
buf[2] = hex_digits[(flags >> 4) & 0xF];
buf[3] = hex_digits[(flags >> 0) & 0xF];
buf[4] = ' ';
buf[5] = hex_digits[(foo[16] >> 0) & 0xF];
buf[6] = ' ';
buf[7] = 0;
bios_write(buf);
#endif
uint16_t reg[7];
uint32_t reg[7];
reg[0] = (0x0E << 8) + 'J';
reg[1] = 0;
reg[2] = 0;
@ -134,6 +153,7 @@ main()
bios_func(0x10, reg);
bios_write("what?\r\n");
#endif
for (;;) {
__asm__ ("hlt");

8
src/std.c
View file

@ -10,3 +10,11 @@ memcpy(void *dst, const void *src, size_t n)
: "memory");
return dst;
}
size_t
strlen(const char *s)
{
size_t l = 0;
while (s[l]) l++;
return l;
}

2
src/std.h
View file

@ -38,4 +38,6 @@ void *memmove(void *dst, const void *src, size_t n);
void *memset (void *dst, int c, size_t n);
int memcmp (const void *src1, const void *src2, size_t n);
size_t strlen(const char *s);
#endif