| int multiboot_skip_partition=0;␊ |
| int multiboot_skip_partition_set=0;␊ |
| ␊ |
| void boot(int biosdev);␊ |
| ␊ |
| // Global multiboot info, if using multiboot.␊ |
| struct multiboot_info *gMI;␊ |
| ␊ |
|
| // would be on the stack which would possibly be using way too much stack.␊ |
| void multiboot_to_boot(int multiboot_magic, struct multiboot_info *mi_orig)␊ |
| {␊ |
| hi_multiboot(multiboot_magic, mi_orig);␊ |
| ␉uint32_t bootdevice = hi_multiboot(multiboot_magic, mi_orig);␊ |
| ␉if(bootdevice != BAD_BOOT_DEVICE)␊ |
| ␉{␊ |
| ␉␉// boot only returns to do a chain load.␊ |
| ␉␉for(;;)␊ |
| ␉␉{ // NOTE: boot only uses the last byte (the drive number)␊ |
| ␉␉␉common_boot(bootdevice);␊ |
| ␉␉␉if(chainbootflag)␊ |
| ␉␉␉␉chainLoad();␊ |
| ␉␉␉else␊ |
| ␉␉␉␉waitThenReload();␊ |
| ␉␉}␊ |
| ␉}␊ |
| ␉// Avoid returning to high-memory address which isn't valid in the segment␊ |
| ␉// we are now in.␊ |
| ␉// Calling sleep() ensures the user ought to be able to use Ctrl+Alt+Del␊ |
| ␉// because the BIOS will have interrupts on.␊ |
| ␉for(;;)␊ |
| ␉␉sleep(10);␊ |
| ␉// NOTE: *IF* we needed to return we'd have to fix up our return address to␊ |
| ␉// be in low memory using the same trick as below.␊ |
| ␉// However, there doesn't seem to be any point in returning to assembly␊ |
| ␉// particularly when the remaining code merely halts the processor.␊ |
| }␊ |
| ␊ |
| void chainLoad()␊ |
|
| // That is unless it's inlined in which case it does not matter.␊ |
| uint32_t bootdevice = multiboot(multiboot_magic, mi_p);␊ |
| ␊ |
| if(bootdevice != BAD_BOOT_DEVICE)␊ |
| {␊ |
| // boot only returns to do a chain load.␊ |
| for(;;)␊ |
| { // NOTE: boot only uses the last byte (the drive number)␊ |
| boot(bootdevice);␊ |
| if(chainbootflag)␊ |
| chainLoad();␊ |
| else␊ |
| waitThenReload();␊ |
| }␊ |
| }␊ |
| ␊ |
| // Avoid returning to high-memory address which isn't valid in the segment␊ |
| // we are now in.␊ |
| // Calling sleep() ensures the user ought to be able to use Ctrl+Alt+Del␊ |
| // because the BIOS will have interrupts on.␊ |
| for(;;)␊ |
| sleep(10);␊ |
| // NOTE: *IF* we needed to return we'd have to fix up our return address to␊ |
| // be in low memory using the same trick as below.␊ |
| // However, there doesn't seem to be any point in returning to assembly␊ |
| // particularly when the remaining code merely halts the processor.␊ |
| ␊ |
| // We're about to exit and temporaryBootArgs will no longer be valid␊ |
| bootArgs = NULL;␊ |
| return bootdevice;␊ |
