From 7cedda09fc22abc03f5b2e2507c87cc7c480a6a2 Mon Sep 17 00:00:00 2001 From: Richard Qin Date: Sun, 8 Nov 2026 00:17:58 +0800 Subject: [mubios] Write mubios reset entry point Signed-off-by: Richard Qin --- mubios/.gitignore | 3 ++- mubios/arch/reset.S | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 63 insertions(+), 1 deletion(-) create mode 100644 mubios/arch/reset.S (limited to 'mubios') diff --git a/mubios/.gitignore b/mubios/.gitignore index 0f293b7..2a594d5 100644 --- a/mubios/.gitignore +++ b/mubios/.gitignore @@ -1 +1,2 @@ -*.qcow2 \ No newline at end of file +*.qcow2 +build* diff --git a/mubios/arch/reset.S b/mubios/arch/reset.S new file mode 100644 index 0000000..b3dbde2 --- /dev/null +++ b/mubios/arch/reset.S @@ -0,0 +1,61 @@ +# RCC-Project +# +# Copyright (C) 2026 Richard Qin +# +# This file is part of RCC-Project. +# +# RCC-Project is free software; you can redistribute it and/or modify it under +# the terms of the GNU General Public License as published by the Free +# Software Foundation; either version 3 of the License, or (at your option) any +# later version. +# +# RCC-Project is distributed in the hope that it will be useful, but WITHOUT ANY +# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR +# A PARTICULAR PURPOSE. See the GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License along with +# RCC-Project; see the file COPYING. If not see +# . + + .intel_syntax noprefix + .code16 + + .section .text16, "ax" + + .global reset_entry + .type reset_entry, @function + +reset_entry: + cli + cld + + xor ax, ax + mov ds, ax + mov es, ax + mov ss, ax + mov sp, 0x8000 + +reset_halt: + hlt + jmp reset_halt + + .section .reset, "ax" + + .global reset_vector + +reset_vector: + cli + + /* + * The linker places .text16 at physical address 0xF0000. + * F000:0000 therefore reaches the first 16-bit entry. + */ + .byte 0xEA + .word 0x0000 + .word 0xF000 + + .fill 16 - (. - reset_vector), 1, 0x90 + + + + -- cgit v1.2.3