x86: Add processor flags header from linux

arch/i386/cpu/cpu.c

@@ -36,6 +36,7 @@
 #include <common.h>
 #include <command.h>
 #include <asm/processor.h>
+#include <asm/processor-flags.h>
 #include <asm/interrupt.h>
 
 /* Constructor for a conventional segment GDT (or LDT) entry */
@@ -88,12 +89,16 @@ static void reload_gdt(void)
 
 int cpu_init_f(void)
 {
+	const u32 em_rst = ~X86_CR0_EM;
+	const u32 mp_ne_set = X86_CR0_MP | X86_CR0_NE;
+
 	/* initialize FPU, reset EM, set MP and NE */
 	asm ("fninit\n" \
-	     "movl %cr0, %eax\n" \
-	     "andl $~0x4, %eax\n" \
-	     "orl  $0x22, %eax\n" \
-	     "movl %eax, %cr0\n" );
+	     "movl %%cr0, %%eax\n" \
+	     "andl %0, %%eax\n" \
+	     "orl  %1, %%eax\n" \
+	     "movl %%eax, %%cr0\n" \
+	     : : "i" (em_rst), "i" (mp_ne_set) : "eax");
 
 	return 0;
 }

arch/i386/cpu/interrupts.c

@@ -30,6 +30,7 @@
 #include <common.h>
 #include <asm/interrupt.h>
 #include <asm/io.h>
+#include <asm/processor-flags.h>
 
 #define DECLARE_INTERRUPT(x) \
 	".globl irq_"#x"\n" \
@@ -237,7 +238,7 @@ int disable_interrupts(void)
 
 	asm volatile ("pushfl ; popl %0 ; cli\n" : "=g" (flags) : );
 
-	return (flags&0x200); /* IE flags is bit 9 */
+	return flags & X86_EFLAGS_IF; /* IE flags is bit 9 */
 }
 
 /* IRQ Low-Level Service Routine */

arch/i386/cpu/sc520/sc520.c

@@ -26,6 +26,7 @@
 
 #include <common.h>
 #include <asm/io.h>
+#include <asm/processor-flags.h>
 #include <asm/ic/sc520.h>
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -41,6 +42,8 @@ volatile sc520_mmcr_t *sc520_mmcr = (sc520_mmcr_t *)0xfffef000;
 
 void init_sc520(void)
 {
+	const u32 nw_cd_rst = ~(X86_CR0_NW | X86_CR0_CD);
+
 	/*
 	 * Set the UARTxCTL register at it's slower,
 	 * baud clock giving us a 1.8432 MHz reference
@@ -84,8 +87,8 @@ void init_sc520(void)
 
 	/* turn on the cache and disable write through */
 	asm("movl	%%cr0, %%eax\n"
-	    "andl	$0x9fffffff, %%eax\n"
-	    "movl	%%eax, %%cr0\n"  : : : "eax");
+	    "andl	%0, %%eax\n"
+	    "movl	%%eax, %%cr0\n"  : : "i" (nw_cd_rst) : "eax");
 }
 
 unsigned long init_sc520_dram(void)

arch/i386/cpu/start.S

@@ -26,6 +26,7 @@
 #include <config.h>
 #include <version.h>
 #include <asm/global_data.h>
+#include <asm/processor-flags.h>
 
 
 .section .text
@@ -46,7 +47,7 @@ _i386boot_start:
 
 	/* Turn of cache (this might require a 486-class CPU) */
 	movl	%cr0, %eax
-	orl	$0x60000000, %eax
+	orl	$(X86_CR0_NW | X86_CR0_CD), %eax
 	movl	%eax, %cr0
 	wbinvd
 

arch/i386/cpu/start16.S

@@ -23,6 +23,7 @@
  */
 
 #include <asm/global_data.h>
+#include <asm/processor-flags.h>
 
 #define BOOT_SEG	0xffff0000	/* linear segment of boot code */
 #define a32		.byte 0x67;
@@ -45,7 +46,7 @@ board_init16_ret:
 
 	/* Turn of cache (this might require a 486-class CPU) */
 	movl	%cr0, %eax
-	orl	$0x60000000, %eax
+	orl	$(X86_CR0_NW & X86_CR0_CD), %eax
 	movl	%eax, %cr0
 	wbinvd
 
@@ -55,7 +56,7 @@ o32 cs	lgdt	gdt_ptr
 
 	/* Now, we enter protected mode */
 	movl	%cr0, %eax
-	orl	$1, %eax
+	orl	$X86_CR0_PE, %eax
 	movl	%eax, %cr0
 
 	/* Flush the prefetch queue */

arch/i386/include/asm/processor-flags.h

@@ -0,0 +1,100 @@
+#ifndef _ASM_X86_PROCESSOR_FLAGS_H
+#define _ASM_X86_PROCESSOR_FLAGS_H
+/* Various flags defined: can be included from assembler. */
+
+/*
+ * EFLAGS bits
+ */
+#define X86_EFLAGS_CF	0x00000001 /* Carry Flag */
+#define X86_EFLAGS_PF	0x00000004 /* Parity Flag */
+#define X86_EFLAGS_AF	0x00000010 /* Auxillary carry Flag */
+#define X86_EFLAGS_ZF	0x00000040 /* Zero Flag */
+#define X86_EFLAGS_SF	0x00000080 /* Sign Flag */
+#define X86_EFLAGS_TF	0x00000100 /* Trap Flag */
+#define X86_EFLAGS_IF	0x00000200 /* Interrupt Flag */
+#define X86_EFLAGS_DF	0x00000400 /* Direction Flag */
+#define X86_EFLAGS_OF	0x00000800 /* Overflow Flag */
+#define X86_EFLAGS_IOPL	0x00003000 /* IOPL mask */
+#define X86_EFLAGS_NT	0x00004000 /* Nested Task */
+#define X86_EFLAGS_RF	0x00010000 /* Resume Flag */
+#define X86_EFLAGS_VM	0x00020000 /* Virtual Mode */
+#define X86_EFLAGS_AC	0x00040000 /* Alignment Check */
+#define X86_EFLAGS_VIF	0x00080000 /* Virtual Interrupt Flag */
+#define X86_EFLAGS_VIP	0x00100000 /* Virtual Interrupt Pending */
+#define X86_EFLAGS_ID	0x00200000 /* CPUID detection flag */
+
+/*
+ * Basic CPU control in CR0
+ */
+#define X86_CR0_PE	0x00000001 /* Protection Enable */
+#define X86_CR0_MP	0x00000002 /* Monitor Coprocessor */
+#define X86_CR0_EM	0x00000004 /* Emulation */
+#define X86_CR0_TS	0x00000008 /* Task Switched */
+#define X86_CR0_ET	0x00000010 /* Extension Type */
+#define X86_CR0_NE	0x00000020 /* Numeric Error */
+#define X86_CR0_WP	0x00010000 /* Write Protect */
+#define X86_CR0_AM	0x00040000 /* Alignment Mask */
+#define X86_CR0_NW	0x20000000 /* Not Write-through */
+#define X86_CR0_CD	0x40000000 /* Cache Disable */
+#define X86_CR0_PG	0x80000000 /* Paging */
+
+/*
+ * Paging options in CR3
+ */
+#define X86_CR3_PWT	0x00000008 /* Page Write Through */
+#define X86_CR3_PCD	0x00000010 /* Page Cache Disable */
+
+/*
+ * Intel CPU features in CR4
+ */
+#define X86_CR4_VME	0x00000001 /* enable vm86 extensions */
+#define X86_CR4_PVI	0x00000002 /* virtual interrupts flag enable */
+#define X86_CR4_TSD	0x00000004 /* disable time stamp at ipl 3 */
+#define X86_CR4_DE	0x00000008 /* enable debugging extensions */
+#define X86_CR4_PSE	0x00000010 /* enable page size extensions */
+#define X86_CR4_PAE	0x00000020 /* enable physical address extensions */
+#define X86_CR4_MCE	0x00000040 /* Machine check enable */
+#define X86_CR4_PGE	0x00000080 /* enable global pages */
+#define X86_CR4_PCE	0x00000100 /* enable performance counters at ipl 3 */
+#define X86_CR4_OSFXSR	0x00000200 /* enable fast FPU save and restore */
+#define X86_CR4_OSXMMEXCPT 0x00000400 /* enable unmasked SSE exceptions */
+#define X86_CR4_VMXE	0x00002000 /* enable VMX virtualization */
+#define X86_CR4_OSXSAVE 0x00040000 /* enable xsave and xrestore */
+
+/*
+ * x86-64 Task Priority Register, CR8
+ */
+#define X86_CR8_TPR	0x0000000F /* task priority register */
+
+/*
+ * AMD and Transmeta use MSRs for configuration; see <asm/msr-index.h>
+ */
+
+/*
+ *      NSC/Cyrix CPU configuration register indexes
+ */
+#define CX86_PCR0	0x20
+#define CX86_GCR	0xb8
+#define CX86_CCR0	0xc0
+#define CX86_CCR1	0xc1
+#define CX86_CCR2	0xc2
+#define CX86_CCR3	0xc3
+#define CX86_CCR4	0xe8
+#define CX86_CCR5	0xe9
+#define CX86_CCR6	0xea
+#define CX86_CCR7	0xeb
+#define CX86_PCR1	0xf0
+#define CX86_DIR0	0xfe
+#define CX86_DIR1	0xff
+#define CX86_ARR_BASE	0xc4
+#define CX86_RCR_BASE	0xdc
+
+#ifdef __KERNEL__
+#ifdef CONFIG_VM86
+#define X86_VM_MASK	X86_EFLAGS_VM
+#else
+#define X86_VM_MASK	0 /* No VM86 support */
+#endif
+#endif
+
+#endif /* _ASM_X86_PROCESSOR_FLAGS_H */