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Boot sectors!

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MBR now booting successfully!
This commit is contained in:
Peter Weingartner 2022-03-25 16:08:00 -04:00
parent b0e6e00b9c
commit e7d96cbf1b
4 changed files with 13737 additions and 13756 deletions
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40
src/boot.c
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@ -88,7 +88,7 @@ void cli_command_get(char * path) {
*
* @return 0 if not bootable, non-zero if bootable
*/
short is_bootable(unsigned short * sector, short device) {
short is_bootable(unsigned char * sector, short device) {
switch(device) {
case BDEV_FDC:
// TODO: handled floppy drives
@ -346,9 +346,16 @@ void boot_from_bdev(short device) {
}
if (device >= 0) {
int i;
for (i = 0; i < 512; i++) {
// Zero out the buffer
BOOT_SECTOR_BUFFER[i] = 0;
}
// Try to load the boot sector
short result = bdev_read(device, 0, BOOT_SECTOR_BUFFER, 512);
if (result == 0) {
if (result > 0) {
// Check to see if it's bootable
bootable = is_bootable(BOOT_SECTOR_BUFFER, device);
}
@ -356,7 +363,6 @@ void boot_from_bdev(short device) {
if (bootable) {
// If bootable, run it
print(cli_screen, "Running boot sector!\n");
boot_sector_run(device);
} else {
@ -365,21 +371,18 @@ void boot_from_bdev(short device) {
// Execute startup file on boot device (if present)
switch (device) {
case BDEV_SDC:
print(cli_screen, "Reading configuration from SDC.\n");
if (cli_exec_batch(cli_screen, MCP_INIT_SDC) != 0) {
cli_exec_batch(cli_screen, MCP_INIT_HDC);
}
break;
case BDEV_FDC:
print(cli_screen, "Reading configuration from floppy.\n");
if (cli_exec_batch(cli_screen, MCP_INIT_FDC) != 0) {
cli_exec_batch(cli_screen, MCP_INIT_HDC);
}
break;
case BDEV_HDC:
print(cli_screen, "Reading configuration from PATA.\n");
cli_exec_batch(cli_screen, MCP_INIT_HDC);
break;
@ -446,15 +449,16 @@ short boot_non_booting(short device) {
}
const unsigned char boot_from_file_sector[] = {
0x60, 0x00, 0x00, 0x06, // bra.w boot
CPU_M68000, 0x00, 0xf0, 0xe1, // dc.b CPU_M68000, 0, 0xf0, 0xe1
0x30, 0x3c, 0x00, 0x40, // boot: move.w #$40,d0
0x20, 0x7a, 0x00, 0x0c, // move.l path(pc),a0
0x42, 0x82, // clr.l d2
0x42, 0x43, // clr.l d3
0x4e, 0x4f, // trap #15
0x4e, 0x71, // bootloop nop
0x60, 0xfc // bra bootloop
0x60, 0x00, 0x00, 0x06, // bra.w boot
CPU_M68000, 0x00, 0xf0, 0xe1, // dc.b CPU_M68000, 0, 0xf0, 0xe1
0x30, 0x3c, 0x00, 0x40, // boot: move.w #$40,d0
0x43, 0xfa, 0x00, 0x0e, // lea (path,pc),a1
0x22, 0x09, // move.l a1,d1
0x42, 0x82, // clr.l d2
0x42, 0x83, // clr.l d3
0x4e, 0x4f, // trap #15
0x4e, 0x71, // bootloop nop
0x60, 0xfc // bra bootloop
};
/**
@ -468,8 +472,6 @@ short boot_set_file(short device, const char * path) {
unsigned char * buffer, x;
short result = 0, i = 0;
print(0, "Attempting to boot_set_file\n");
buffer = (unsigned char *)malloc(FSYS_SECTOR_SZ);
if (buffer != 0) {
// Try to read the current sector
@ -479,13 +481,11 @@ short boot_set_file(short device, const char * path) {
int path_len = strlen(path);
// Boot record read... clear it out
print(0, "Clearing\n");
for (i = 0; i < 0x1B0; i++) {
buffer[i] = 0;
}
// Copy the boot code over
print(0, "Copying code\n");
for (i = 0; i < sector_len; i++) {
buffer[i] = boot_from_file_sector[i];
}
@ -497,11 +497,9 @@ short boot_set_file(short device, const char * path) {
buffer[path_len + sector_len] = 0;
// Try to write it back
print(0, "Writing\n");
n = sys_bdev_write(device, 0, buffer, FSYS_SECTOR_SZ);
if (n == FSYS_SECTOR_SZ) {
// Success!
print(0, "Done\n");
result = 0;
} else {
result = DEV_CANNOT_WRITE;

9388
src/foenixmcp.s68
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File diff suppressed because it is too large Load diff

18063
src/mapfile
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File diff suppressed because it is too large Load diff

2
src/version.h
View file

@ -7,6 +7,6 @@
#define VER_MAJOR 0
#define VER_MINOR 4
#define VER_BUILD 3
#define VER_BUILD 5
#endif