x86 realmode: Use x86emu register file + defines

By using the (global) register file as defined by x86emu,
we can use the same register access for YABEL and realmode
interrupt handlers.

- the x86 realmode interrupt handlers changed in signature
- to access registers, use X86_$REGNAME now (eg. X86_EAX)
- x86_exception_handler still uses struct eregs *regs to
  avoid spilling the x86emu register file stuff everywhere

Coccinelle script that handled most of this commit:
  @ inthandler @
  identifier FUNC, regs;
  @@
  int FUNC(
  -struct eregs *regs
  +void
   )
  { ... }

  @ depends on inthandler @
  identifier regs;
  @@
  -regs->eax
  +X86_EAX

  @ depends on inthandler @
  identifier regs;
  @@
  -regs->ebx
  +X86_EBX

  @ depends on inthandler @
  identifier regs;
  @@
  -regs->ecx
  +X86_ECX

  @ depends on inthandler @
  identifier regs;
  @@
  -regs->edx
  +X86_EDX

  @ depends on inthandler @
  identifier regs;
  @@
  -regs->esi
  +X86_ESI

  @ depends on inthandler @
  identifier regs;
  @@
  -regs->edi
  +X86_EDI

  @ depends on inthandler @
  identifier regs;
  @@
  -regs->eflags
  +X86_EFLAGS

  @ depends on inthandler @
  identifier regs;
  @@
  -regs->vector
  +M.x86.intno

Change-Id: I60cc2c36646fe4b7f97457b1e297e3df086daa36
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/1891
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 19 insertions, 18 deletions

diff --git a/src/northbridge/via/vx800/vga.c b/src/northbridge/via/vx800/vga.c
index be522f884c..319dbda7de 100644
--- a/src/northbridge/via/vx800/vga.c
+++ b/src/northbridge/via/vx800/vga.c
@@ -33,6 +33,7 @@
 #include <cpu/x86/mtrr.h>
 #include <cpu/x86/msr.h>
 #include <arch/interrupt.h>
+#include <x86emu/regs.h>
 #if CONFIG_PCI_OPTION_ROM_RUN_REALMODE
 #include <devices/oprom/realmode/x86.h>
 #endif
@@ -50,14 +51,14 @@
 #define VIACONFIG_VGA_PCI_10 0xf8000008
 #define VIACONFIG_VGA_PCI_14 0xfc000000
 
-static int via_vx800_int15_handler(struct eregs *regs)
+static int via_vx800_int15_handler(void)
 {
 	int res=0;
 	printk(BIOS_DEBUG, "via_vx800_int15_handler\n");
-	switch(regs->eax & 0xffff) {
+	switch(X86_EAX & 0xffff) {
 	case 0x5f19:
-		regs->eax=0x5f;
-		regs->ecx=0x03;
+		X86_EAX=0x5f;
+		X86_ECX=0x03;
 		res=1;
 		break;
 	case 0x5f18:
@@ -84,44 +85,44 @@ static int via_vx800_int15_handler(struct eregs *regs)
 		i = (i & 0x70);
 		i = i >> 4;
 		if (i == 0) {
-			regs->eax = 0x00;	//not support 5f18
+			X86_EAX = 0x00;	//not support 5f18
 			break;
 		}
 		i = i + 2;
-		regs->ebx = (u32) i;
+		X86_EBX = (u32) i;
 		i = pci_read_config8(dev, 0x90);
 		i = (i & 0x07);
 		i = i + 3;
 		i = i << 4;
-		regs->ebx = regs->ebx + ((u32) i);
-		regs->eax = 0x5f;
+		X86_EBX = X86_EBX + ((u32) i);
+		X86_EAX = 0x5f;
 		res = 1;
 		break;
 	}
 	case 0x5f00:
-		regs->eax = 0x005f;
+		X86_EAX = 0x005f;
 		res = 1;
 		break;
 	case 0x5f01:
-		regs->eax = 0x5f;
-		regs->ecx = (regs->ecx & 0xffffff00 ) | 2; // panel type =  2 = 1024 * 768
+		X86_EAX = 0x5f;
+		X86_ECX = (X86_ECX & 0xffffff00 ) | 2; // panel type =  2 = 1024 * 768
 		res = 1;
 		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
+		X86_EAX=0x5f;
+		X86_EBX= (X86_EBX & 0xffff0000) | 2;
+		X86_ECX= (X86_ECX & 0xffff0000) | 0x401;  // PAL + crt only
+		X86_EDX= (X86_EDX & 0xffff0000) | 0;  // TV Layout - default
 		res=1;
 		break;
 	case 0x5f0f:
-		regs->eax = 0x005f;
+		X86_EAX = 0x005f;
 		res = 1;
 		break;
         default:
 		printk(BIOS_DEBUG, "Unknown INT15 function %04x!\n",
-				regs->eax & 0xffff);
-		regs->eax = 0;
+				X86_EAX & 0xffff);
+		X86_EAX = 0;
 		break;
 	}
 	return res;