From 2c0a717678232438536d0f9238e38e56e440d516 Mon Sep 17 00:00:00 2001 From: Richard Qin Date: Sun, 8 Nov 2026 02:31:53 +0800 Subject: [mubios] Initialize IVT, BDA and EBDA. Signed-off-by: Richard Qin --- mubios/core/memory.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 mubios/core/memory.c (limited to 'mubios/core/memory.c') diff --git a/mubios/core/memory.c b/mubios/core/memory.c new file mode 100644 index 0000000..ee7ac43 --- /dev/null +++ b/mubios/core/memory.c @@ -0,0 +1,48 @@ +/* + 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 + . + */ + +#include "bios.h" + +extern u8 __bss_start[]; +extern u8 __bss_end[]; + +static void +zero_bytes (volatile u8 *start, volatile u8 *end) +{ + volatile u8 *cursor; + + for (cursor = start; cursor < end; ++cursor) + { + *cursor = 0; + } +} + +void +memory_init (void) +{ + zero_bytes ((volatile u8 *)MUBIOS_IVT_BASE, + (volatile u8 *)(MUBIOS_IVT_BASE + MUBIOS_IVT_SIZE)); + + zero_bytes ((volatile u8 *)MUBIOS_BDA_BASE, + (volatile u8 *)(MUBIOS_BDA_BASE + MUBIOS_BDA_SIZE)); + + zero_bytes (__bss_start, __bss_end); +} -- cgit v1.2.3