mirror of
https://github.com/fail0verflow/switch-coreboot.git
synced 2025-05-04 01:39:18 -04:00
White space cleanup in vm86.c so that the next patch is more readable.
Signed-off-by: Myles Watson <mylesgw@gmail.com> Acked-by: Myles Watson <mylesgw@gmail.com> git-svn-id: svn://coreboot.org/repository/coreboot-v3@962 f3766cd6-281f-0410-b1cd-43a5c92072e9
This commit is contained in:
Myles Watson
parent
3eec9e7790
commit
b04f94ae37
1 changed files with 84 additions and 84 deletions
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@ -30,11 +30,11 @@
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#include <io.h>
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/* The address arguments to this function are PHYSICAL ADDRESSES */
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/* The address arguments to this function are PHYSICAL ADDRESSES */
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static void real_mode_switch_call_vga(unsigned long devfn)
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{
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__asm__ __volatile__ (
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/* paranoia -- does ecx get saved? not sure.
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/* paranoia -- does ecx get saved? not sure.
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* This is the easiest safe thing to do.
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*/
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" pushal \n"
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@ -45,7 +45,7 @@ static void real_mode_switch_call_vga(unsigned long devfn)
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"1:\n"
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/* get devfn into %ecx */
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" movl %esp, %ebp \n"
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// FIXME: why is this 8?
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// FIXME: why is this 8?
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" movl 8(%ebp), %ecx \n"
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/* load 'our' gdt */
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" lgdt %cs:__mygdtaddr \n"
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@ -56,10 +56,10 @@ static void real_mode_switch_call_vga(unsigned long devfn)
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" .code16 \n"
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/* 16 bit code from here on... */
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/* Load the segment registers w/ properly configured
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* segment descriptors. They will retain these
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* configurations (limits, writability, etc.) once
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* protected mode is turned off.
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/* Load the segment registers w/ properly configured
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* segment descriptors. They will retain these
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* configurations (limits, writability, etc.) once
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* protected mode is turned off.
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*/
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" mov $0x30, %ax \n"
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" mov %ax, %ds \n"
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@ -77,9 +77,9 @@ static void real_mode_switch_call_vga(unsigned long devfn)
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" ljmp $0, $__rms_real\n"
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"__rms_real: \n"
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/* Setup a stack: Put the stack at the end of page zero.
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/* Setup a stack: Put the stack at the end of page zero.
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* That way we can easily share it between real and
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* protected, since the 16-bit ESP at segment 0 will
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* protected, since the 16-bit ESP at segment 0 will
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* work for any case. */
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" mov $0x0, %ax \n"
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" mov %ax, %ss \n"
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@ -102,15 +102,15 @@ static void real_mode_switch_call_vga(unsigned long devfn)
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/* run VGA BIOS at 0xc000:0003 */
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" lcall $0xc000, $0x0003\n"
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/* If we got here, just about done.
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* Need to get back to protected mode
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/* If we got here, just about done.
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* Need to get back to protected mode
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*/
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" movl %cr0, %eax \n"
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" orl $0x0000001, %eax\n" /* PE = 1 */
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" movl %eax, %cr0 \n"
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/* Now that we are in protected mode
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* jump to a 32 bit code segment.
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/* Now that we are in protected mode
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* jump to a 32 bit code segment.
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*/
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" data32 ljmp $0x10, $vgarestart\n"
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"vgarestart:\n"
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@ -137,12 +137,12 @@ static void real_mode_switch_call_vga(unsigned long devfn)
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// __asm__ (".text\n""real_mode_switch_end:\n");
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// extern char real_mode_switch_end[];
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/* call vga bios int 10 function 0x4f14 to enable main console
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epia-m does not always autosence the main console so forcing it on is good !! */
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/* call vga bios int 10 function 0x4f14 to enable main console
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epia-m does not always autosence the main console so forcing it on is good !! */
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void vga_enable_console(void)
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{
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__asm__ __volatile__ (
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/* paranoia -- does ecx get saved? not sure. This is
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/* paranoia -- does ecx get saved? not sure. This is
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* the easiest safe thing to do. */
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" pushal \n"
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/* save the stack */
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@ -176,8 +176,8 @@ void vga_enable_console(void)
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" ljmp $0, $__vga_ec_real \n"
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"__vga_ec_real: \n"
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/* put the stack at the end of page zero.
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* that way we can easily share it between real and protected,
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/* put the stack at the end of page zero.
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* that way we can easily share it between real and protected,
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* since the 16-bit ESP at segment 0 will work for any case. */
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/* Setup a stack */
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" mov $0x0, %ax \n"
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@ -213,7 +213,7 @@ void vga_enable_console(void)
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" movb $0x55, %al \n"
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" outb %al, $0x80 \n"
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/* if we got here, just about done.
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/* if we got here, just about done.
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* Need to get back to protected mode */
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" movl %cr0, %eax \n"
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" orl $0x0000001, %eax\n" /* PE = 1 */
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@ -243,7 +243,7 @@ void vga_enable_console(void)
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void run_bios(struct device *dev, unsigned long addr)
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{
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int i;
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/* clear vga bios data area */
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for (i = 0x400; i < 0x500; i++) {
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*(unsigned char *) i = 0;
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@ -253,32 +253,32 @@ void run_bios(struct device *dev, unsigned long addr)
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}
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// we had hoped to avoid this.
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// this is a stub IDT only. It's main purpose is to ignore calls
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// to the BIOS.
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// we had hoped to avoid this.
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// this is a stub IDT only. It's main purpose is to ignore calls
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// to the BIOS.
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// no longer. Dammit. We have to respond to these.
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struct realidt {
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unsigned short offset, cs;
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};
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};
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// from a handy writeup that andrey found.
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// handler.
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// There are some assumptions we can make here.
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// First, the Top Of Stack (TOS) is located on the top of page zero.
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// we can share this stack between real and protected mode.
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// handler.
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// There are some assumptions we can make here.
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// First, the Top Of Stack (TOS) is located on the top of page zero.
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// we can share this stack between real and protected mode.
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// that simplifies a lot of things ...
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// we'll just push all the registers on the stack as longwords,
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// and pop to protected mode.
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// second, since this only ever runs as part of coreboot,
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// we'll just push all the registers on the stack as longwords,
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// and pop to protected mode.
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// second, since this only ever runs as part of coreboot,
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// we know all the segment register values -- so we don't save any.
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// keep the handler that calls things small. It can do a call to
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// keep the handler that calls things small. It can do a call to
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// more complex code in coreboot itself. This helps a lot as we don't
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// have to do address fixup in this little stub, and calls are absolute
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// so the handler is relocatable.
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void handler(void)
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{
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__asm__ __volatile__ (
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__asm__ __volatile__ (
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" .code16 \n"
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"idthandle: \n"
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" pushal \n"
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@ -291,7 +291,7 @@ void handler(void)
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void debughandler(void)
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{
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__asm__ __volatile__ (
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__asm__ __volatile__ (
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" .code16 \n"
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"debughandle: \n"
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" pushw %cx \n"
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@ -307,9 +307,9 @@ void debughandler(void)
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// Calling conventions. The first C function is called with this stuff
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// on the stack. They look like value parameters, but note that if you
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// modify them they will go back to the INTx function modified.
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// modify them they will go back to the INTx function modified.
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// the C function will call the biosint function with these as
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// REFERENCE parameters. In this way, we can easily get
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// REFERENCE parameters. In this way, we can easily get
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// returns back to the INTx caller (i.e. vgabios)
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void callbiosint(void)
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{
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@ -321,7 +321,7 @@ void callbiosint(void)
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" push %fs \n"
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" push %gs \n"
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// clean up the int #. To save space we put it in the lower
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// byte. But the top 24 bits are junk.
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// byte. But the top 24 bits are junk.
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" andl $0xff, %eax\n"
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// this push does two things:
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// - put the INT # on the stack as a parameter
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@ -356,7 +356,7 @@ void callbiosint(void)
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" mov %ax, %fs \n"
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" mov %ax, %gs \n"
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" mov %ax, %ss \n"
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/* Turn off protection (bit 0 in CR0) */
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" movl %cr0, %eax \n"
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" andl $0xFFFFFFFE, %eax \n"
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@ -400,7 +400,7 @@ void callbiosint(void)
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}
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enum {
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PCIBIOS = 0x1a,
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PCIBIOS = 0x1a,
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MEMSIZE = 0x12
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};
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@ -411,36 +411,36 @@ int pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
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int handleint21(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
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unsigned long *pesp, unsigned long *pebx, unsigned long *pedx,
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unsigned long *pecx, unsigned long *peax, unsigned long *pflags
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);
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);
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extern void vga_exit(void);
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int biosint(unsigned long intnumber,
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unsigned long gsfs, unsigned long dses,
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unsigned long edi, unsigned long esi,
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unsigned long ebp, unsigned long esp,
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unsigned long ebx, unsigned long edx,
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unsigned long ecx, unsigned long eax,
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unsigned long ebp, unsigned long esp,
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unsigned long ebx, unsigned long edx,
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unsigned long ecx, unsigned long eax,
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unsigned long cs_ip, unsigned short stackflags)
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{
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unsigned long ip;
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unsigned long cs;
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unsigned long ip;
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unsigned long cs;
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unsigned long flags;
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int ret = -1;
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ip = cs_ip & 0xffff;
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cs = cs_ip >> 16;
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flags = stackflags;
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printk(BIOS_DEBUG, "biosint: INT# 0x%lx\n", intnumber);
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printk(BIOS_DEBUG, "biosint: eax 0x%lx ebx 0x%lx ecx 0x%lx edx 0x%lx\n",
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printk(BIOS_DEBUG, "biosint: eax 0x%lx ebx 0x%lx ecx 0x%lx edx 0x%lx\n",
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eax, ebx, ecx, edx);
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printk(BIOS_DEBUG, "biosint: ebp 0x%lx esp 0x%lx edi 0x%lx esi 0x%lx\n",
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ebp, esp, edi, esi);
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printk(BIOS_DEBUG, "biosint: ip 0x%lx cs 0x%lx flags 0x%lx\n",
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ip, cs, flags);
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// cases in a good compiler are just as good as your own tables.
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// cases in a good compiler are just as good as your own tables.
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switch (intnumber) {
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case 0 ... 15:
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// These are not BIOS service, but the CPU-generated exceptions
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@ -457,22 +457,22 @@ int biosint(unsigned long intnumber,
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// "longjmp"
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vga_exit();
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break;
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case PCIBIOS:
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ret = pcibios( &edi, &esi, &ebp, &esp,
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ret = pcibios( &edi, &esi, &ebp, &esp,
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&ebx, &edx, &ecx, &eax, &flags);
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break;
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case MEMSIZE:
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// who cares.
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case MEMSIZE:
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// who cares.
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eax = 64 * 1024;
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ret = 0;
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break;
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case 0x15:
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ret=handleint21( &edi, &esi, &ebp, &esp,
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ret=handleint21( &edi, &esi, &ebp, &esp,
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&ebx, &edx, &ecx, &eax, &flags);
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break;
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default:
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printk(BIOS_INFO, "BIOSINT: Unsupport int #0x%lx\n",
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printk(BIOS_INFO, "BIOSINT: Unsupport int #0x%lx\n",
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intnumber);
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break;
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}
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@ -482,10 +482,10 @@ int biosint(unsigned long intnumber,
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flags &= ~1;
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stackflags = flags;
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return ret;
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}
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}
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void setup_realmode_idt(void)
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void setup_realmode_idt(void)
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{
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extern unsigned char idthandle, end_idthandle;
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#if 0
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@ -496,14 +496,14 @@ void setup_realmode_idt(void)
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struct realidt *idts = (struct realidt *) 0;
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int codesize = &end_idthandle - &idthandle;
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unsigned char *intbyte, *codeptr;
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// for each int, we create a customized little handler
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// that just pushes %ax, puts the int # in %al,
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// then calls the common interrupt handler.
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// this necessitated because intel didn't know much about
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// that just pushes %ax, puts the int # in %al,
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// then calls the common interrupt handler.
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// this necessitated because intel didn't know much about
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// architecture when they did the 8086 (it shows)
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// (hmm do they know anymore even now :-)
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// obviously you can see I don't really care about memory
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// obviously you can see I don't really care about memory
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// efficiency. If I did I would probe back through the stack
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// and get it that way. But that's really disgusting.
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for (i = 0; i < 256; i++) {
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@ -514,11 +514,11 @@ void setup_realmode_idt(void)
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intbyte = codeptr + 3;
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*intbyte = i;
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}
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// fixed entry points
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// VGA BIOSes tend to hardcode f000:f065 as the previous handler of
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// int10.
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// int10.
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// calling convention here is the same as INTs, we can reuse
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// the int entry code.
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codeptr = (unsigned char *) 0xff065;
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@ -526,14 +526,14 @@ void setup_realmode_idt(void)
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intbyte = codeptr + 3;
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*intbyte = 0x42; /* int42 is the relocated int10 */
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/* The source of the following code is not yet known.
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* We feel it may be useful someday, but right now it
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* scribbles over code space. We are leaving it here as a
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* "Living comment" since it may at some point be needed
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/* The source of the following code is not yet known.
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* We feel it may be useful someday, but right now it
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* scribbles over code space. We are leaving it here as a
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* "Living comment" since it may at some point be needed
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* again. It is a very intriguing idea -- one could run
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* vm86 code with TF set and set programmable times
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* vm86 code with TF set and set programmable times
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* between instructions to slow them down. For those who
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* recall the "turbo" switch on old PCs, this is the
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* recall the "turbo" switch on old PCs, this is the
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* software equivalent.
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*/
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#if 0
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@ -544,7 +544,7 @@ void setup_realmode_idt(void)
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memcpy((void *)16384, &debughandle, &end_debughandle - &debughandle);
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#endif
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}
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@ -561,25 +561,25 @@ enum {
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};
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// errors go in AH. Just set these up so that word assigns
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// will work. KISS.
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// will work. KISS.
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enum {
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PCIBIOS_NODEV = 0x8600,
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PCIBIOS_BADREG = 0x8700
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};
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int
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pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
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unsigned long *pesp, unsigned long *pebx, unsigned long *pedx,
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pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
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unsigned long *pesp, unsigned long *pebx, unsigned long *pedx,
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unsigned long *pecx, unsigned long *peax, unsigned long *pflags)
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{
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unsigned short func = (unsigned short) *peax;
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int retval = 0;
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unsigned short devid, vendorid, devfn;
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/* Use short to get rid of gabage in upper half of 32-bit register */
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short devindex;
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short devindex;
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unsigned char bus;
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struct device *dev;
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switch(func) {
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case CHECK:
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*pedx = 0x4350;
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@ -601,7 +601,7 @@ pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
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unsigned short busdevfn;
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*peax = 0;
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// busnum is an unsigned char;
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// devfn is an int, so we mask it off.
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// devfn is an int, so we mask it off.
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busdevfn = (dev->bus->secondary << 8)
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| (dev->path.pci.devfn & 0xff);
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printk(BIOS_DEBUG, "0x%x: return 0x%x\n", func, busdevfn);
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@ -624,7 +624,7 @@ pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
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unsigned short word;
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unsigned char byte;
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unsigned char reg;
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devfn = *pebx & 0xff;
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bus = *pebx >> 8;
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reg = *pedi;
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@ -661,8 +661,8 @@ pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
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pci_write_config32(dev, reg, dword);
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break;
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}
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if (retval)
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if (retval)
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retval = PCIBIOS_BADREG;
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printk(BIOS_DEBUG, "0x%x: bus %d devfn 0x%x reg 0x%x val 0x%lx\n",
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func, bus, devfn, reg, *pecx);
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@ -674,9 +674,9 @@ pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
|
|||
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,
|
||||
|
|
@ -704,7 +704,7 @@ int handleint21(unsigned long *edi, unsigned long *esi, unsigned long *ebp,
|
|||
case 0x5f02:
|
||||
*eax=0x5f;
|
||||
*ebx= (*ebx & 0xffff0000) | 2;
|
||||
*ecx= (*ecx & 0xffff0000) | 0x401; // PAL + crt only
|
||||
*ecx= (*ecx & 0xffff0000) | 0x401; // PAL + crt only
|
||||
*edx= (*edx & 0xffff0000) | 0; // TV Layout - default
|
||||
res=0;
|
||||
break;
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue