Where is libbios located?

[lf94]

Looking at the little sample application, it uses bios calls to display stuff. Then looking at the Makefile, it's clear it requires libbios, but I cannot find it in this project. Where is it?

[simias]

That's a good question, I haven't looked at this in a while and I can't recall how I linked everything together. I suppose I simply reused the code I used to link my C programs, which is in my psx-hardware-tests. At any rate it's very simple code, it's just a bunch of "trampoline" function to call into the BIOS itself. The code itself is here: https://github.com/simias/psx-hardware-tests/tree/master/runtime and the BIOS routines are generated from bios-vectors.in using generate-bios-vectors.awk. The generated file looks like this:

.set mips1
.set noreorder
.set noat
.set nomacro

.text

.section .text.bios_printf
.global bios_printf
.type bios_printf, function

bios_printf:
	j  0xa0
	li $t1, 0x3f

.section .text.bios_flush_cache
.global bios_flush_cache
.type bios_flush_cache, function

bios_flush_cache:
	j  0xa0
	li $t1, 0x44

.section .text.bios_gpu_sync
.global bios_gpu_sync
.type bios_gpu_sync, function

bios_gpu_sync:
	j  0xa0
	li $t1, 0x4e

.section .text.bios_gpu_command_word
.global bios_gpu_command_word
.type bios_gpu_command_word, function

bios_gpu_command_word:
	j  0xa0
	li $t1, 0x49

.section .text.bios_gpu_command_word_and_params
.global bios_gpu_command_word_and_params
.type bios_gpu_command_word_and_params, function

bios_gpu_command_word_and_params:
	j  0xa0
	li $t1, 0x4a

.section .text.bios_gpu_gp1_command_word
.global bios_gpu_gp1_command_word
.type bios_gpu_gp1_command_word, function

bios_gpu_gp1_command_word:
	j  0xa0
	li $t1, 0x48

.section .text.bios_gpu_get_status
.global bios_gpu_get_status
.type bios_gpu_get_status, function

bios_gpu_get_status:
	j  0xa0
	li $t1, 0x4d

.section .text.bios_kernel_redirect
.global bios_kernel_redirect
.type bios_kernel_redirect, function

bios_kernel_redirect:
	j  0xc0
	li $t1, 0x1b