svn commit: r250311 - stable/8/sys/compat/x86bios

[Jung-uk Kim]

Author: jkim
Date: Mon May  6 21:13:22 2013
New Revision: 250311
URL: http://svnweb.freebsd.org/changeset/base/250311

Log:
  MFC:	r210877 (partial)
  
  Decrease emulated stack size from 64K to 4K bytes.

Modified:
  stable/8/sys/compat/x86bios/x86bios.c
  stable/8/sys/compat/x86bios/x86bios.h

Modified: stable/8/sys/compat/x86bios/x86bios.c
==============================================================================
--- stable/8/sys/compat/x86bios/x86bios.c	Mon May  6 21:04:42 2013	(r250310)
+++ stable/8/sys/compat/x86bios/x86bios.c	Mon May  6 21:13:22 2013	(r250311)
@@ -55,7 +55,6 @@ __FBSDID("$FreeBSD$");
 #define	X86BIOS_PAGE_SIZE	0x00001000	/* 4K */
 
 #define	X86BIOS_IVT_SIZE	0x00000500	/* 1K + 256 (BDA) */
-#define	X86BIOS_SEG_SIZE	0x00010000	/* 64K */
 #define	X86BIOS_MEM_SIZE	0x00100000	/* 1M */
 
 #define	X86BIOS_IVT_BASE	0x00000000
@@ -63,11 +62,12 @@ __FBSDID("$FreeBSD$");
 #define	X86BIOS_ROM_BASE	0x000a0000
 
 #define	X86BIOS_ROM_SIZE	(X86BIOS_MEM_SIZE - (uint32_t)x86bios_rom_phys)
+#define	X86BIOS_SEG_SIZE	X86BIOS_PAGE_SIZE
 
 #define	X86BIOS_PAGES		(X86BIOS_MEM_SIZE / X86BIOS_PAGE_SIZE)
 
-#define	X86BIOS_R_DS		_pad1
 #define	X86BIOS_R_SS		_pad2
+#define	X86BIOS_R_SP		_pad3.I16_reg.x_reg
 
 static struct x86emu x86bios_emu;
 
@@ -332,8 +332,8 @@ x86bios_init_regs(struct x86regs *regs)
 {
 
 	bzero(regs, sizeof(*regs));
-	regs->X86BIOS_R_DS = 0x40;
-	regs->X86BIOS_R_SS = x86bios_seg_phys >> 4;
+	regs->X86BIOS_R_SS = X86BIOS_PHYSTOSEG(x86bios_seg_phys);
+	regs->X86BIOS_R_SP = X86BIOS_PAGE_SIZE - 2;
 }
 
 void

Modified: stable/8/sys/compat/x86bios/x86bios.h
==============================================================================
--- stable/8/sys/compat/x86bios/x86bios.h	Mon May  6 21:04:42 2013	(r250310)
+++ stable/8/sys/compat/x86bios/x86bios.h	Mon May  6 21:13:22 2013	(r250311)
@@ -138,8 +138,8 @@ typedef struct x86regs	x86regs_t;
 #define	R_FS		register_fs
 #define	R_GS		register_gs
 
-#define	X86BIOS_PHYSTOSEG(x)	(((x) >> 4) & 0xffff)
-#define	X86BIOS_PHYSTOOFF(x)	((x) & 0x000f)
+#define	X86BIOS_PHYSTOSEG(x)	(((x) >> 4) & 0xff00)
+#define	X86BIOS_PHYSTOOFF(x)	((x) & 0x0fff)
 
 __BEGIN_DECLS
 void	*x86bios_alloc(uint32_t *offset, size_t size);