diff options
Diffstat (limited to 'src/northbridge/via/cx700')
| -rw-r--r-- | src/northbridge/via/cx700/Kconfig | 35 | ||||
| -rw-r--r-- | src/northbridge/via/cx700/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/northbridge/via/cx700/cx700_vga.c | 56 | ||||
| -rw-r--r-- | src/northbridge/via/cx700/vgabios.c | 782 |
4 files changed, 76 insertions, 798 deletions
diff --git a/src/northbridge/via/cx700/Kconfig b/src/northbridge/via/cx700/Kconfig index 58e2047a14..916c4c3dc9 100644 --- a/src/northbridge/via/cx700/Kconfig +++ b/src/northbridge/via/cx700/Kconfig @@ -5,14 +5,35 @@ config NORTHBRIDGE_VIA_CX700 select IOAPIC select SMP -# this is done by the northbridge's vgabios.c already -config VGA_ROM_RUN - bool - default n +# TODO: What should be the per-chipset default value here? +choice + prompt "Onboard graphics" + default CX700_VIDEO_MB_32MB depends on NORTHBRIDGE_VIA_CX700 -config PCI_ROM_RUN - bool - default n +# TODO: Setting the amount of gfx memory is not yet supported in the source code. +config CX700_VIDEO_MB_OFF + bool "Disabled, 0KB" +config CX700_VIDEO_MB_8MB + bool "Enabled, 8MB" +config CX700_VIDEO_MB_16MB + bool "Enabled, 16MB" +config CX700_VIDEO_MB_32MB + bool "Enabled, 32MB" +config CX700_VIDEO_MB_64MB + bool "Enabled, 64MB" +config CX700_VIDEO_MB_128MB + bool "Enabled, 128MB" + +endchoice + +config VIDEO_MB + int + default 0 if CX700_VIDEO_MB_OFF + default 8 if CX700_VIDEO_MB_8MB + default 16 if CX700_VIDEO_MB_16MB + default 32 if CX700_VIDEO_MB_32MB + default 64 if CX700_VIDEO_MB_64MB + default 128 if CX700_VIDEO_MB_128MB depends on NORTHBRIDGE_VIA_CX700 diff --git a/src/northbridge/via/cx700/Makefile.inc b/src/northbridge/via/cx700/Makefile.inc index 85e984a443..1221fd5f8b 100644 --- a/src/northbridge/via/cx700/Makefile.inc +++ b/src/northbridge/via/cx700/Makefile.inc @@ -19,7 +19,6 @@ obj-y += cx700_reset.o obj-y += northbridge.o -obj-y += vgabios.o driver-y += cx700_agp.o driver-y += cx700_lpc.o diff --git a/src/northbridge/via/cx700/cx700_vga.c b/src/northbridge/via/cx700/cx700_vga.c index c259b376ad..88fac179f2 100644 --- a/src/northbridge/via/cx700/cx700_vga.c +++ b/src/northbridge/via/cx700/cx700_vga.c @@ -29,6 +29,7 @@ #include <cpu/cpu.h> #include <cpu/x86/mtrr.h> #include <cpu/x86/msr.h> +#include <arch/interrupt.h> #include "chip.h" #include "northbridge.h" @@ -41,9 +42,44 @@ #define CRTC_INDEX 0x3d4 #define CRTC_DATA 0x3d5 -void setup_realmode_idt(void); -void do_vgabios(void); -void vga_enable_console(void); +static int via_cx700_int15_handler(struct eregs *regs) +{ + int res=-1; + printk(BIOS_DEBUG, "via_cx700_int15_handler\n"); + switch(regs->eax & 0xffff) { + case 0x5f19: + break; + case 0x5f18: + regs->eax=0x5f; + regs->ebx=0x545; // MCLK = 133, 32M frame buffer, 256 M main memory + regs->ecx=0x060; + res=0; + break; + case 0x5f00: + regs->eax = 0x8600; + break; + case 0x5f01: + regs->eax = 0x5f; + regs->ecx = (regs->ecx & 0xffffff00 ) | 2; // panel type = 2 = 1024 * 768 + res = 0; + break; + case 0x5f02: + regs->eax=0x5f; + regs->ebx= (regs->ebx & 0xffff0000) | 2; + regs->ecx= (regs->ecx & 0xffff0000) | 0x401; // PAL + crt only + regs->edx= (regs->edx & 0xffff0000) | 0; // TV Layout - default + res=0; + break; + case 0x5f0f: + regs->eax=0x860f; + break; + default: + printk(BIOS_DEBUG, "Unknown INT15 function %04x!\n", + regs->eax & 0xffff); + break; + } + return res; +} void write_protect_vgabios(void) { @@ -64,7 +100,7 @@ static void vga_init(device_t dev) { u8 reg8; - printk(BIOS_DEBUG, "Initializing VGA...\n"); + mainboard_interrupt_handlers(0x15, &via_cx700_int15_handler); //* pci_write_config8(dev, 0x04, 0x07); @@ -75,12 +111,16 @@ static void vga_init(device_t dev) pci_write_config8(dev, 0x3c, 0x0b); //*/ - printk(BIOS_DEBUG, "Executing VGA option rom in real mode\n"); - setup_realmode_idt(); - do_vgabios(); + printk(BIOS_DEBUG, "Initializing VGA...\n"); + + pci_dev_init(dev); + printk(BIOS_DEBUG, "Enable VGA console\n"); + // this is how it should look: + // call_bios_interrupt(0x10,0x4f1f,0x8003,1,0); + // this is how it looks: vga_enable_console(); - + /* It's not clear if these need to be programmed before or after * the VGA bios runs. Try both, clean up later */ /* Set memory rate to 200MHz */ diff --git a/src/northbridge/via/cx700/vgabios.c b/src/northbridge/via/cx700/vgabios.c deleted file mode 100644 index 59b3239204..0000000000 --- a/src/northbridge/via/cx700/vgabios.c +++ /dev/null @@ -1,782 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * (C) 2007-2009 coresystems GmbH - * (See further copyright notices below) - * - * NOTE: This file is supposed to go away once the generic vm86 handler - * in util/x86emu is able to handle intXX hooks like yabel does. - * - * 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 - * the Free Software Foundation; version 2 of the License. - * - * This program 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 this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include <console/console.h> -#include <device/pci.h> -#include <device/pci_ids.h> -#include <device/pci_ops.h> -#undef __KERNEL__ -#include <arch/io.h> -#include <string.h> -#include <cbfs.h> - -void write_protect_vgabios(void); - -/* vgabios.c. Derived from: */ - -/*------------------------------------------------------------ -*- C -*- - * 2 Kernel Monte a.k.a. Linux loading Linux on x86 - * - * Erik Arjan Hendriks <hendriks@lanl.gov> - * - * This version is a derivative of the original two kernel monte - * which is (C) 2000 Scyld. - * - * Copyright (C) 2000 Scyld Computing Corporation - * - * Portions related to the alpha architecture are: - * - * Copyright(C) 2001 University of California. LA-CC Number 01-67. - * This software has been authored by an employee or employees of the - * University of California, operator of the Los Alamos National - * Laboratory under Contract No. W-7405-ENG-36 with the U.S. - * Department of Energy. The U.S. Government has rights to use, - * reproduce, and distribute this software. If the software is - * modified to produce derivative works, such modified software should - * be clearly marked, so as not to confuse it with the version - * available from LANL. - * - * This software may be used and distributed according to the terms - * of the GNU General Public License, incorporated herein by - * reference to http://www.gnu.org/licenses/gpl.html. - * - * This software is provided by the author(s) "as is" and any express - * or implied warranties, including, but not limited to, the implied - * warranties of merchantability and fitness for a particular purpose - * are disclaimed. In no event shall the author(s) be liable for any - * direct, indirect, incidental, special, exemplary, or consequential - * damages (including, but not limited to, procurement of substitute - * goods or services; loss of use, data, or profits; or business - * interruption) however caused and on any theory of liability, - * whether in contract, strict liability, or tort (including - * negligence or otherwise) arising in any way out of the use of this - * software, even if advised of the possibility of such damage. - * - *--------------------------------------------------------------------*/ - -/* Modified to be a self sufficient plug in so that it can be used - without reliance on other parts of core Linuxbios - (C) 2005 Nick.Barker9@btinternet.com - - Used initially for epia-m where there are problems getting the bios - emulator to successfully run this bios. -*/ - -/* Declare a temporary global descriptor table - necessary because the - Core part of the bios no longer sets up any 16 bit segments */ -__asm__( - /* pointer to original gdt */ - "gdtarg: \n" - " .word gdt_limit \n" - " .long gdt \n" - /* compute the table limit */ - "__mygdt_limit = __mygdt_end - __mygdt - 1 \n" - "__mygdtaddr: \n" - " .word __mygdt_limit \n" - " .long __mygdt \n" - "__mygdt: \n" - /* selgdt 0, unused */ - " .word 0x0000, 0x0000 \n" - " .byte 0x00, 0x00, 0x00, 0x00 \n" - /* selgdt 8, unused */ - " .word 0x0000, 0x0000 \n" - " .byte 0x00, 0x00, 0x00, 0x00 \n" - /* selgdt 0x10, flat code segment */ - " .word 0xffff, 0x0000 \n" - " .byte 0x00, 0x9b, 0xcf, 0x00 \n" - /* selgdt 0x18, flat data segment */ - " .word 0xffff, 0x0000 \n" - " .byte 0x00, 0x93, 0xcf, 0x00 \n" - /* selgdt 0x20, unused */ - " .word 0x0000, 0x0000 \n" - " .byte 0x00, 0x00, 0x00, 0x00 \n" - /* selgdt 0x28 16-bit 64k code at 0x00000000 */ - " .word 0xffff, 0x0000 \n" - " .byte 0, 0x9a, 0, 0 \n" - /* selgdt 0x30 16-bit 64k data at 0x00000000 */ - " .word 0xffff, 0x0000 \n" - " .byte 0, 0x92, 0, 0 \n" - "__mygdt_end: \n"); - -/* Declare a pointer to where our idt is going to be i.e. at mem zero */ -__asm__("__myidt: \n" - /* 16-bit limit */ - " .word 1023 \n" - /* 24-bit base */ - " .long 0 \n" " .word 0 \n"); - -/* The address arguments to this function are PHYSICAL ADDRESSES */ -static void real_mode_switch_call_vga(unsigned long devfn) -{ - __asm__ __volatile__( - // paranoia -- does ecx get saved? not sure. This is - // the easiest safe thing to do. - " pushal \n" - /* save the stack */ - " mov %esp, __stack \n" - " jmp 1f \n" - "__stack: .long 0 \n" "1:\n" - /* get devfn into %ecx */ - " movl %esp, %ebp \n" - " movl 8(%ebp), %ecx \n" - /* load 'our' gdt */ - " lgdt %cs:__mygdtaddr \n" - /* This configures CS properly for real mode. */ - " ljmp $0x28, $__rms_16bit\n" - "__rms_16bit: \n" - " .code16 \n" - /* 16 bit code from here on... */ - /* Load the segment registers w/ properly configured segment - * descriptors. They will retain these configurations (limits, - * writability, etc.) once protected mode is turned off. */ - " mov $0x30, %ax \n" - " mov %ax, %ds \n" - " mov %ax, %es \n" - " mov %ax, %fs \n" - " mov %ax, %gs \n" - " mov %ax, %ss \n" - /* Turn off protection (bit 0 in CR0) */ - " movl %cr0, %eax \n" - " andl $0xFFFFFFFE, %eax \n" - " movl %eax, %cr0 \n" - /* Now really going into real mode */ - " ljmp $0, $__rms_real\n" - "__rms_real: \n" - /* put the stack at the end of page zero. - * that way we can easily share it between real and protected, - * since the 16-bit ESP at segment 0 will work for any case. - */ - /* Setup a stack */ - " mov $0x0, %ax \n" - " mov %ax, %ss \n" - " movl $0x1000, %eax \n" - " movl %eax, %esp \n" - /* Load our 16 it idt */ - " xor %ax, %ax \n" - " mov %ax, %ds \n" - " lidt __myidt \n" - /* Dump zeros in the other segregs */ - " mov %ax, %es \n" - " mov %ax, %fs \n" - " mov %ax, %gs \n" - " mov $0x40, %ax \n" - " mov %ax, %ds \n" - " mov %cx, %ax \n" - /* run VGA BIOS at 0xc000:0003 */ - " lcall $0xc000, $0x0003\n" - /* if we got here, just about done. - * Need to get back to protected mode */ - " movl %cr0, %eax \n" " orl $0x0000001, %eax\n" /* PE = 1 */ - " movl %eax, %cr0 \n" - /* Now that we are in protected mode jump to a 32 bit code segment. */ - " data32 ljmp $0x10, $vgarestart\n" - "vgarestart:\n" - " .code32\n" - " movw $0x18, %ax \n" - " mov %ax, %ds \n" - " mov %ax, %es \n" - " mov %ax, %fs \n" - " mov %ax, %gs \n" - " mov %ax, %ss \n" - /* restore proper gdt and idt */ - " lgdt %cs:gdtarg \n" - " lidt idtarg \n" - ".globl vga_exit \n" - "vga_exit: \n" - " mov __stack, %esp \n" - " popal \n"); -} - -__asm__(".text\n" "real_mode_switch_end:\n"); -extern char real_mode_switch_end[]; - -/* call vga bios int 10 function 0x4f14 to enable main console - epia-m does not always autosence the main console so forcing it on is good !! */ -void vga_enable_console(void) -{ - __asm__ __volatile__( - /* paranoia -- does ecx get saved? not sure. This is - * the easiest safe thing to do. */ - " pushal \n" - /* save the stack */ - " mov %esp, __stack \n" - /* load 'our' gdt */ - " lgdt %cs:__mygdtaddr \n" - /* This configures CS properly for real mode. */ - " ljmp $0x28, $__vga_ec_16bit\n" - "__vga_ec_16bit: \n" - " .code16 \n" - /* 16 bit code from here on... */ - /* Load the segment registers w/ properly configured segment - * descriptors. They will retain these configurations (limits, - * writability, etc.) once protected mode is turned off. */ - " mov $0x30, %ax \n" - " mov %ax, %ds \n" - " mov %ax, %es \n" - " mov %ax, %fs \n" - " mov %ax, %gs \n" - " mov %ax, %ss \n" - /* Turn off protection (bit 0 in CR0) */ - " movl %cr0, %eax \n" - " andl $0xFFFFFFFE, %eax\n" - " movl %eax, %cr0 \n" - /* Now really going into real mode */ - " ljmp $0, $__vga_ec_real \n" - "__vga_ec_real: \n" - /* put the stack at the end of page zero. - * that way we can easily share it between real and protected, - * since the 16-bit ESP at segment 0 will work for any case. - */ - /* Setup a stack */ - " mov $0x0, %ax \n" - " mov %ax, %ss \n" - " movl $0x1000, %eax \n" - " movl %eax, %esp \n" - /* debugging for RGM */ - " mov $0x11, %al \n" - " outb %al, $0x80 \n" - /* Load our 16 it idt */ - " xor %ax, %ax \n" - " mov %ax, %ds \n" - " lidt __myidt \n" - /* Dump zeros in the other segregs */ - " mov %ax, %ds \n" - " mov %ax, %es \n" - " mov %ax, %fs \n" - " mov %ax, %gs \n" - /* ask bios to enable main console */ - /* set up for int 10 call - values found from X server - * bios call routines */ - " movw $0x4f14,%ax \n" - " movw $0x8003,%bx \n" - " movw $1, %cx \n" - " movw $0, %dx \n" - " movw $0, %di \n" - " int $0x10 \n" - " movb $0x55, %al \n" - " outb %al, $0x80 \n" - /* if we got here, just about done. - * Need to get back to protected mode */ - " movl %cr0, %eax \n" " orl $0x0000001, %eax\n" /* PE = 1 */ - " movl %eax, %cr0 \n" - /* Now that we are in protected mode jump to a 32 bit code segment. */ - " data32 ljmp $0x10, $vga_ec_restart\n" - "vga_ec_restart:\n" - " .code32\n" - " movw $0x18, %ax \n" - " mov %ax, %ds \n" - " mov %ax, %es \n" - " mov %ax, %fs \n" - " mov %ax, %gs \n" - " mov %ax, %ss \n" - /* restore proper gdt and idt */ - " lgdt %cs:gdtarg \n" - " lidt idtarg \n" - " .globl vga__ec_exit \n" - "vga_ec_exit:\n" - " mov __stack, %esp \n" - " popal\n"); -} - -void do_vgabios(void) -{ - device_t dev; - unsigned long busdevfn; - unsigned int rom = 0; - unsigned char *buf; - unsigned int size = 64 * 1024; - int i; - - /* clear vga bios data area */ - for (i = 0x400; i < 0x500; i++) { - *(unsigned char *)i = 0; - } - - dev = dev_find_class(PCI_CLASS_DISPLAY_VGA << 8, 0); - - if (!dev) { - printk(BIOS_DEBUG, "NO VGA FOUND\n"); - return; - } - printk(BIOS_DEBUG, "found VGA: vid=%x, did=%x\n", dev->vendor, dev->device); - - /* declare rom address here - keep any config data out of the way - * of core LXB stuff */ - -#warning ROM address hardcoded to 512K - rom = (unsigned int)cbfs_load_optionrom(dev->vendor, dev->device, 0); - pci_write_config32(dev, PCI_ROM_ADDRESS, rom | 1); - printk(BIOS_DEBUG, "rom base, size: %x\n", rom); - - buf = (unsigned char *)rom; - if ((buf[0] == 0x55) && (buf[1] == 0xaa)) { - memcpy((void *)0xc0000, buf, size); - - write_protect_vgabios(); // in northbridge - - // check signature again - buf = (unsigned char *)0xc0000; - if (buf[0] == 0x55 && buf[1] == 0xAA) { - busdevfn = - (dev->bus->secondary << 8) | dev->path.pci.devfn; - printk(BIOS_DEBUG, "bus/devfn = %#lx\n", busdevfn); - - real_mode_switch_call_vga(busdevfn); - } else - printk(BIOS_DEBUG, "Failed to copy VGA BIOS to 0xc0000\n"); - } else - printk(BIOS_DEBUG, "BAD SIGNATURE 0x%x 0x%x\n", buf[0], buf[1]); - - pci_write_config32(dev, PCI_ROM_ADDRESS, 0); -} - -// we had hoped to avoid this. -// this is a stub IDT only. It's main purpose is to ignore calls -// to the BIOS. -// no longer. Dammit. We have to respond to these. -struct realidt { - unsigned short offset, cs; -}; - -// from a handy writeup that andrey found. - -// handler. -// There are some assumptions we can make here. -// First, the Top Of Stack (TOS) is located on the top of page zero. -// we can share this stack between real and protected mode. -// that simplifies a lot of things ... -// we'll just push all the registers on the stack as longwords, -// and pop to protected mode. -// second, since this only ever runs as part of linuxbios, -// we know all the segment register values -- so we don't save any. -// keep the handler that calls things small. It can do a call to -// more complex code in linuxbios itself. This helps a lot as we don't -// have to do address fixup in this little stub, and calls are absolute -// so the handler is relocatable. -void handler(void) -{ - __asm__ __volatile__(" .code16 \n" - "idthandle: \n" - " pushal \n" - " movb $0, %al \n" - " ljmp $0, $callbiosint16\n" - "end_idthandle: \n" - " .code32 \n"); -} - -void debughandler(void) -{ - __asm__ __volatile__(" .code16 \n" - "debughandle: \n" - " pushw %cx \n" - " movw $250, %cx \n" - "dbh1: \n" - " loop dbh1 \n" - " popw %cx \n" - " iret \n" - "end_debughandle: \n" ".code32 \n"); -} - -// Calling conventions. The first C function is called with this stuff -// on the stack. They look like value parameters, but note that if you -// modify them they will go back to the INTx function modified. -// the C function will call the biosint function with these as -// REFERENCE parameters. In this way, we can easily get -// returns back to the INTx caller (i.e. vgabios) -void callbiosint(void) -{ - __asm__ __volatile__(" .code16 \n" - "callbiosint16: \n" - " push %ds \n" - " push %es \n" - " push %fs \n" " push %gs \n" - // clean up the int #. To save space we put it in the lower - // byte. But the top 24 bits are junk. - " andl $0xff, %eax\n" - // this push does two things: - // - put the INT # on the stack as a parameter - // - provides us with a temp for the %cr0 mods. - " pushl %eax \n" " movl %cr0, %eax\n" " orl $0x00000001, %eax\n" /* PE = 1 */ - " movl %eax, %cr0\n" - /* Now that we are in protected mode jump to a 32 bit code segment. */ - " data32 ljmp $0x10, $biosprotect\n" - "biosprotect: \n" - " .code32 \n" - " movw $0x18, %ax \n" - " mov %ax, %ds \n" - " mov %ax, %es \n" - " mov %ax, %fs \n" - " mov %ax, %gs \n" - " mov %ax, %ss \n" - " lidt idtarg \n" - " call biosint \n" - // back to real mode ... - " ljmp $0x28, $__rms_16bit2\n" - "__rms_16bit2: \n" - " .code16 \n" - /* 16 bit code from here on... */ - /* Load the segment registers w/ properly configured segment - * descriptors. They will retain these configurations (limits, - * writability, etc.) once protected mode is turned off. */ - " mov $0x30, %ax \n" - " mov %ax, %ds \n" - " mov %ax, %es \n" - " mov %ax, %fs \n" - " mov %ax, %gs \n" - " mov %ax, %ss \n" - /* Turn off protection (bit 0 in CR0) */ - " movl %cr0, %eax \n" - " andl $0xFFFFFFFE, %eax \n" - " movl %eax, %cr0 \n" - /* Now really going into real mode */ - " ljmp $0, $__rms_real2 \n" - "__rms_real2: \n" - /* Setup a stack - * FixME: where is esp? */ - " mov $0x0, %ax \n" - " mov %ax, %ss \n" - /* ebugging for RGM */ - " mov $0x11, %al \n" - " outb %al, $0x80 \n" - /* Load our 16 it idt */ - " xor %ax, %ax \n" - " mov %ax, %ds \n" - " lidt __myidt \n" - /* Dump zeros in the other segregs */ - " mov %ax, %es \n" - " mov %ax, %fs \n" - " mov %ax, %gs \n" - " mov $0x40, %ax \n" - " mov %ax, %ds \n" - /* pop the INT # that you pushed earlier */ - " popl %eax \n" - " pop %gs \n" - " pop %fs \n" - " pop %es \n" - " pop %ds \n" - " popal \n" - " iret \n" - " .code32 \n"); -} - -enum { - PCIBIOS = 0x1a, - MEMSIZE = 0x12 -}; - -int pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp, - unsigned long *pesp, unsigned long *pebx, unsigned long *pedx, - unsigned long *pecx, unsigned long *peax, unsigned long *pflags); - -int handleint21(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp, - unsigned long *pesp, unsigned long *pebx, unsigned long *pedx, - unsigned long *pecx, unsigned long *peax, - unsigned long *pflags); - -extern void vga_exit(void); - -int biosint(unsigned long intnumber, - unsigned long gsfs, unsigned long dses, - unsigned long edi, unsigned long esi, - unsigned long ebp, unsigned long esp, - unsigned long ebx, unsigned long edx, - unsigned long ecx, unsigned long eax, - unsigned long cs_ip, unsigned short stackflags) -{ - unsigned long ip; - unsigned long cs; - unsigned long flags; - int ret = -1; - - ip = cs_ip & 0xffff; - cs = cs_ip >> 16; - flags = stackflags; - - printk(BIOS_DEBUG, "biosint: INT# 0x%lx\n", intnumber); - printk(BIOS_DEBUG, "biosint: eax 0x%lx ebx 0x%lx ecx 0x%lx edx 0x%lx\n", - eax, ebx, ecx, edx); - printk(BIOS_DEBUG, "biosint: ebp 0x%lx esp 0x%lx edi 0x%lx esi 0x%lx\n", - ebp, esp, edi, esi); - printk(BIOS_DEBUG, "biosint: ip 0x%lx cs 0x%lx flags 0x%lx\n", - ip, cs, flags); - - // cases in a good compiler are just as good as your own tables. - switch (intnumber) { - case 0 ... 15: - // These are not BIOS service, but the CPU-generated exceptions - printk(BIOS_INFO, "biosint: Oops, exception %lu\n", intnumber); - if (esp < 0x1000) { - printk(BIOS_DEBUG, "Stack contents: "); - while (esp < 0x1000) { - printk(BIOS_DEBUG, "0x%04x ", *(unsigned short *)esp); - esp += 2; - } - printk(BIOS_DEBUG, "\n"); - } - printk(BIOS_DEBUG, "biosint: Bailing out\n"); - // "longjmp" - vga_exit(); - break; - - case PCIBIOS: - ret = pcibios(&edi, &esi, &ebp, &esp, - &ebx, &edx, &ecx, &eax, &flags); - break; - case MEMSIZE: - // who cares. - eax = 64 * 1024; - ret = 0; - break; - case 0x15: - ret = handleint21(&edi, &esi, &ebp, &esp, - &ebx, &edx, &ecx, &eax, &flags); - break; - default: - printk(BIOS_INFO, "BIOSINT: Unsupport int #0x%lx\n", intnumber); - break; - } - if (ret) - flags |= 1; // carry flags - else - flags &= ~1; - stackflags = flags; - return ret; -} - -void setup_realmode_idt(void) -{ - extern unsigned char idthandle, end_idthandle; - extern unsigned char debughandle, end_debughandle; - - int i; - struct realidt *idts = (struct realidt *)0; - int codesize = &end_idthandle - &idthandle; - unsigned char *intbyte, *codeptr; - - // for each int, we create a customized little handler - // that just pushes %ax, puts the int # in %al, - // then calls the common interrupt handler. - // this necessitated because intel didn't know much about - // architecture when they did the 8086 (it shows) - // (hmm do they know anymore even now :-) - // obviously you can see I don't really care about memory - // efficiency. If I did I would probe back through the stack - // and get it that way. But that's really disgusting. - for (i = 0; i < 256; i++) { - idts[i].cs = 0; - codeptr = (unsigned char *)4096 + i * codesize; - idts[i].offset = (unsigned)codeptr; - memcpy(codeptr, &idthandle, codesize); - intbyte = codeptr + 3; - *intbyte = i; - } - - // fixed entry points - - // VGA BIOSes tend to hardcode f000:f065 as the previous handler of - // int10. - // calling convention here is the same as INTs, we can reuse - // the int entry code. - codeptr = (unsigned char *)0xff065; - memcpy(codeptr, &idthandle, codesize); - intbyte = codeptr + 3; - *intbyte = 0x42; /* int42 is the relocated int10 */ - - // VIA's VBIOS will call f000:f859 instead of sending int15. - codeptr = (unsigned char *)0xff859; - memcpy(codeptr, &idthandle, codesize); - intbyte = codeptr + 3; - *intbyte = 0x15; - - /* debug handler - useful to set a programmable delay between instructions if the - TF bit is set upon call to real mode */ - idts[1].cs = 0; - idts[1].offset = 16384; - memcpy((void *)16384UL, &debughandle, &end_debughandle - &debughandle); -} - -enum { - CHECK = 0xb001, - FINDDEV = 0xb102, - READCONFBYTE = 0xb108, - READCONFWORD = 0xb109, - READCONFDWORD = 0xb10a, - WRITECONFBYTE = 0xb10b, - WRITECONFWORD = 0xb10c, - WRITECONFDWORD = 0xb10d -}; - -// errors go in AH. Just set these up so that word assigns -// will work. KISS. -enum { - PCIBIOS_NODEV = 0x8600, - PCIBIOS_BADREG = 0x8700 -}; - -int -pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp, - unsigned long *pesp, unsigned long *pebx, unsigned long *pedx, - unsigned long *pecx, unsigned long *peax, unsigned long *pflags) -{ - unsigned short func = (unsigned short)(*peax); - int retval = 0; - unsigned short devid, vendorid, devfn; - short devindex; /* Use short to get rid of garbage in upper half of 32-bit register */ - unsigned char bus; - device_t dev; - - switch (func) { - case CHECK: - *pedx = 0x4350; - *pecx = 0x2049; - retval = 0; - break; - case FINDDEV: - { - devid = *pecx; - vendorid = *pedx; - devindex = *pesi; - dev = 0; - while ((dev = dev_find_device(vendorid, devid, dev))) { - if (devindex <= 0) - break; - devindex--; - } - if (dev) { - unsigned short busdevfn; - *peax = 0; - // busnum is an unsigned char; - // devfn is an int, so we mask it off. - busdevfn = (dev->bus->secondary << 8) - | (dev->path.pci.devfn & 0xff); - printk(BIOS_DEBUG, "0x%x: return 0x%x\n", func, - busdevfn); - *pebx = busdevfn; - retval = 0; - } else { - *peax = PCIBIOS_NODEV; - retval = -1; - } - } - break; - case READCONFDWORD: - case READCONFWORD: - case READCONFBYTE: - case WRITECONFDWORD: - case WRITECONFWORD: - case WRITECONFBYTE: - { - unsigned long dword; - unsigned short word; - unsigned char byte; - unsigned char reg; - - devfn = *pebx & 0xff; - bus = *pebx >> 8; - reg = *pedi; - dev = dev_find_slot(bus, devfn); - if (!dev) { - printk(BIOS_DEBUG, "0x%x: BAD DEVICE bus %d devfn 0x%x\n", - func, bus, devfn); - // idiots. the pcibios guys assumed you'd never pass a bad bus/devfn! - *peax = PCIBIOS_BADREG; - retval = -1; - } - switch (func) { - case READCONFBYTE: - byte = pci_read_config8(dev, reg); - *pecx = byte; - break; - case READCONFWORD: - word = pci_read_config16(dev, reg); - *pecx = word; - break; - case READCONFDWORD: - dword = pci_read_config32(dev, reg); - *pecx = dword; - break; - case WRITECONFBYTE: - byte = *pecx; - pci_write_config8(dev, reg, byte); - break; - case WRITECONFWORD: - word = *pecx; - pci_write_config16(dev, reg, word); - break; - case WRITECONFDWORD: - dword = *pecx; - pci_write_config32(dev, reg, dword); - break; - } - - if (retval) - retval = PCIBIOS_BADREG; - printk(BIOS_DEBUG, "0x%x: bus %d devfn 0x%x reg 0x%x val 0x%lx\n", - func, bus, devfn, reg, *pecx); - *peax = 0; - retval = 0; - } - break; - default: - printk(BIOS_ERR, "UNSUPPORTED PCIBIOS FUNCTION 0x%x\n", func); - break; - } - - return retval; -} - -int handleint21(unsigned long *edi, unsigned long *esi, unsigned long *ebp, - unsigned long *esp, unsigned long *ebx, unsigned long *edx, - unsigned long *ecx, unsigned long *eax, unsigned long *flags) -{ - int res = -1; - switch (*eax & 0xffff) { - case 0x5f19: - break; - case 0x5f18: - *eax = 0x5f; - *ebx = 0x545; // MCLK = 133, 32M frame buffer, 256 M main memory - *ecx = 0x060; - res = 0; - break; - case 0x5f00: - *eax = 0x8600; - break; - case 0x5f01: - *eax = 0x5f; - *ecx = (*ecx & 0xffffff00) | 2; // panel type = 2 = 1024 * 768 - res = 0; - break; - case 0x5f02: - *eax = 0x5f; - *ebx = (*ebx & 0xffff0000) | 2; - *ecx = (*ecx & 0xffff0000) | 0x401; // PAL + crt only - *edx = (*edx & 0xffff0000) | 0; // TV Layout - default - res = 0; - break; - case 0x5f0f: - *eax = 0x860f; - break; - } - return res; -} |