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https://github.com/fail0verflow/switch-coreboot.git
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0528863e20
southbridge drivers in Kconfig. * It includes initial superio code as well, but there is at least one error in the pnp_device.c/superio scenario left * Fixed biosemu.c, vm86.c, pnp_device.c (sort of) * Enable vm86 instead of x86emu per default for vga init for now. This makes VGA in qemu work. There might be a bug in x86emu or the compiler I am using. (gcc version 4.1.2 20070115 (prerelease) (SUSE Linux)) * Import isa-dma.c, keyboard.c and i8259.c from v2 /pc80, which was taken from LinuxBIOSv1 released from LANL under release LA-CC Number 00-34 and using parts from the Linux kernel. This patch makes vga and keyboard work in qemu. Yippie Signed-off-by: Stefan Reinauer <stepan@coresystems.de> Acked-by: Ronald G. Minnich <rminnich@gmail.com> git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@260 f3766cd6-281f-0410-b1cd-43a5c92072e9
41 lines
1.6 KiB
C
41 lines
1.6 KiB
C
#include <arch/io.h>
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/* code taken from:
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!
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! setup.S Copyright (C) 1991, 1992 Linus Torvalds
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!
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! setup.s is responsible for getting the system data from the BIOS,
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! and putting them into the appropriate places in system memory.
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! both setup.s and system has been loaded by the bootblock.
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*/
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/* we're getting screwed again and again by this problem of the 8259.
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* so we're going to leave this lying around for inclusion into
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* crt0.S on an as-needed basis.
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! well, that went ok, I hope. Now we have to reprogram the interrupts :-(
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! we put them right after the intel-reserved hardware interrupts, at
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! int 0x20-0x2F. There they won't mess up anything. Sadly IBM really
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! messed this up with the original PC, and they haven't been able to
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! rectify it afterwards. Thus the bios puts interrupts at 0x08-0x0f,
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! which is used for the internal hardware interrupts as well. We just
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! have to reprogram the 8259's, and it isn't fun.
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*/
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void setup_i8259(void)
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{
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outb(0x11, 0x20); /*! initialization sequence to 8259A-1*/
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outb(0x11, 0xA0); /*! and to 8259A-2*/
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outb(0x20, 0x21); /*! start of hardware int's (0x20)*/
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outb(0x28, 0xA1); /*! start of hardware int's 2 (0x28)*/
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outb(0x04, 0x21); /*! 8259-1 is master*/
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outb(0x02, 0xA1); /*! 8259-2 is slave*/
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outb(0x01, 0x21); /*! 8086 mode for both*/
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outb(0x01, 0xA1);
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outb(0xFF, 0xA1); /*! mask off all interrupts for now*/
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outb(0xFB, 0x21); /*! mask all irq's but irq2 which is cascaded*/
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}
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/*
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* I like the way Linus says it:
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! Well, that certainly wasn't fun :-(. Hopefully it works, and we don't
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! need no steenking BIOS anyway (except for the initial loading :-).
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*/
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