# pcboot - bootable PC demo/game kernel
-# Copyright (C) 2018 John Tsiombikas <nuclear@member.fsf.org>
+# Copyright (C) 2018-2019 John Tsiombikas <nuclear@member.fsf.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# 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.
#
# along with this program. If not, see <https://www.gnu.org/licenses/>.
.code32
- .section .startup
+ .section .startup,"ax"
.extern _bss_start
.extern _bss_end
+ .extern pcboot_main
+ .extern wait_vsync
+ .extern kb_getkey
+ .equ STACKTOP,0x80000
+
+ # move the stack to the top of the conventional memory
+ cli
+ movl $STACKTOP, %esp
+ # push a 0 ret-addr to terminate gdb backtraces
+ pushl $0
+
+ # zero the BSS section
xor %eax, %eax
- mov _bss_start, %edi
- mov _bss_size, %ecx
+ mov $_bss_start, %edi
+ mov $_bss_size, %ecx
+ cmp $0, %ecx
+ jz skip_bss_zero
shr $4, %ecx
rep stosl
+skip_bss_zero:
+
+ call pcboot_main
+ # pcboot_main never returns
+0: cli
+ hlt
+ jmp 0b
+
+ # this is called once after memory init, to move the protected mode
+ # stack to the top of usable memory, to avoid interference from 16bit
+ # programs (as much as possible)
+ .global move_stack
+move_stack:
+ # calculate the currently used lowest address of the stack (rounded
+ # down to 4-byte alignment), to see where to start copying
+ mov %esp, %esi
+ and $0xfffffffc, %esi
+ # calculate the size we need to copy
+ mov $STACKTOP, %ecx
+ sub %esi, %ecx
+ # load the destination address to edi
+ mov 4(%esp), %edi
+ sub %ecx, %edi
+ # size in longwords
+ shr $2, %ecx
+
+ # change esp to the new stack
+ mov $STACKTOP, %ecx
+ sub %esp, %ecx
+ mov 4(%esp), %eax
+ mov %eax, %esp
+ sub %ecx, %esp
+
+ rep movsd
+ ret