x86: Port x86 over to compile cleanly with x86-64

Change-Id: I26f1bbf027435be593f11bce4780111dcaf7cb86
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Signed-off-by: Scott Duplichan <scott@notabs.org>
Reviewed-on: http://review.coreboot.org/10586
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

13 files changed, 243 insertions, 50 deletions

diff --git a/src/arch/x86/boot/boot.c b/src/arch/x86/boot/boot.c
index d86a6c3..7eb87fb 100644
--- a/src/arch/x86/boot/boot.c
+++ b/src/arch/x86/boot/boot.c
@@ -39,17 +39,74 @@ static void jmp_payload(void *entry, unsigned long buffer, unsigned long size)
 	/* Jump to kernel */
 	__asm__ __volatile__(
 		"	cld	\n\t"
+#ifdef __x86_64__
+		/* switch back to 32-bit mode */
+		"       push    %4\n\t"
+		"       push    %3\n\t"
+		"       push    %2\n\t"
+		"       push    %1\n\t"
+		"       push    %0\n\t"
+
+		".intel_syntax noprefix\n\t"
+		/* use iret to switch to 32-bit code segment */
+		"       xor     rax,rax\n\t"
+		"       mov     ax, ss\n\t"
+		"       push    rax\n\t"
+		"       mov     rax, rsp\n\t"
+		"       add     rax, 8\n\t"
+		"       push    rax\n\t"
+		"       pushfq\n\t"
+		"       push    0x10\n\t"
+		"       lea     rax,[rip+3]\n\t"
+		"       push    rax\n\t"
+		"       iretq\n\t"
+		".code32\n\t"
+		/* disable paging */
+		"       mov     eax, cr0\n\t"
+		"       btc     eax, 31\n\t"
+		"       mov     cr0, eax\n\t"
+		/* disable long mode */
+		"       mov     ecx, 0xC0000080\n\t"
+		"       rdmsr\n\t"
+		"       btc     eax, 8\n\t"
+		"       wrmsr\n\t"
+
+		"       pop     eax\n\t"
+		"       add     esp, 4\n\t"
+		"       pop     ebx\n\t"
+		"       add     esp, 4\n\t"
+		"       pop     ecx\n\t"
+
+		"       add     esp, 4\n\t"
+		"       pop     edx\n\t"
+		"       add     esp, 4\n\t"
+		"       pop     esi\n\t"
+		"       add     esp, 4\n\t"
+
+		".att_syntax prefix\n\t"
+#endif
+
 		/* Save the callee save registers... */
 		"	pushl	%%esi\n\t"
 		"	pushl	%%edi\n\t"
 		"	pushl	%%ebx\n\t"
 		/* Save the parameters I was passed */
+#ifdef __x86_64__
+		"	pushl	$0\n\t"    /* 20 adjust */
+	        "	pushl	%%eax\n\t" /* 16 lb_start */
+		"	pushl	%%ebx\n\t" /* 12 buffer */
+		"	pushl	%%ecx\n\t" /*  8 lb_size */
+		"	pushl	%%edx\n\t" /*  4 entry */
+		"	pushl	%%esi\n\t" /*  0 elf_boot_notes */
+#else
 		"	pushl	$0\n\t" /* 20 adjust */
 	        "	pushl	%0\n\t" /* 16 lb_start */
 		"	pushl	%1\n\t" /* 12 buffer */
 		"	pushl	%2\n\t" /*  8 lb_size */
 		"	pushl	%3\n\t" /*  4 entry */
 		"	pushl	%4\n\t" /*  0 elf_boot_notes */
+
+#endif
 		/* Compute the adjustment */
 		"	xorl	%%eax, %%eax\n\t"
 		"	subl	16(%%esp), %%eax\n\t"
@@ -115,7 +172,9 @@ static void jmp_payload(void *entry, unsigned long buffer, unsigned long size)
 		"	popl	%%ebx\n\t"
 		"	popl	%%edi\n\t"
 		"	popl	%%esi\n\t"
-
+#ifdef __x86_64__
+		".code64\n\t"
+#endif
 		::
 		"ri" (lb_start), "ri" (buffer), "ri" (lb_size),
 		"ri" (entry),
@@ -140,7 +199,12 @@ void arch_prog_run(struct prog *prog)
 	if (ENV_RAMSTAGE)
 		try_payload(prog);
 	__asm__ volatile (
+#ifdef __x86_64__
+		"jmp  *%%rdi\n"
+#else
 		"jmp  *%%edi\n"
+#endif
+
 		:: "D"(prog_entry(prog))
 	);
 }
diff --git a/src/arch/x86/boot/gdt.c b/src/arch/x86/boot/gdt.c
index 44156ea..a21fab2 100644
--- a/src/arch/x86/boot/gdt.c
+++ b/src/arch/x86/boot/gdt.c
@@ -26,7 +26,11 @@
 /* i386 lgdt argument */
 struct gdtarg {
 	u16 limit;
+#ifdef __x86_64__
+	u64 base;
+#else
 	u32 base;
+#endif
 } __attribute__((packed));
 
 /* Copy GDT to new location and reload it.
@@ -35,7 +39,7 @@ struct gdtarg {
 static void move_gdt(int is_recovery)
 {
 	void *newgdt;
-	u16 num_gdt_bytes = (u32)&gdt_end - (u32)&gdt;
+	u16 num_gdt_bytes = (uintptr_t)&gdt_end - (uintptr_t)&gdt;
 	struct gdtarg gdtarg;
 
 	newgdt = cbmem_find(CBMEM_ID_GDT);
@@ -49,7 +53,7 @@ static void move_gdt(int is_recovery)
 		memcpy((void*)newgdt, &gdt, num_gdt_bytes);
 	}
 
-	gdtarg.base = (u32)newgdt;
+	gdtarg.base = (uintptr_t)newgdt;
 	gdtarg.limit = num_gdt_bytes - 1;
 
 	__asm__ __volatile__ ("lgdt %0\n\t" : : "m" (gdtarg));
diff --git a/src/arch/x86/boot/mpspec.c b/src/arch/x86/boot/mpspec.c
index 4474d7c..1a0ac31 100644
--- a/src/arch/x86/boot/mpspec.c
+++ b/src/arch/x86/boot/mpspec.c
@@ -73,7 +73,7 @@ static unsigned char smp_compute_checksum(void *v, int len)
 	return checksum;
 }
 
-static void *smp_write_floating_table_physaddr(u32 addr, u32 mpf_physptr, unsigned int virtualwire)
+static void *smp_write_floating_table_physaddr(uintptr_t addr, uintptr_t mpf_physptr, unsigned int virtualwire)
 {
 	struct intel_mp_floating *mf;
 	void *v;
@@ -591,6 +591,7 @@ unsigned long __attribute__((weak)) write_smp_table(unsigned long addr)
 
 	mptable_lintsrc(mc, isa_bus);
 	tmp = mptable_finalize(mc);
-	printk(BIOS_INFO, "MPTABLE len: %d\n", (unsigned int)tmp - (unsigned int)v);
+	printk(BIOS_INFO, "MPTABLE len: %d\n", (unsigned int)((uintptr_t)tmp -
+				(uintptr_t)v));
 	return (unsigned long)tmp;
 }
diff --git a/src/arch/x86/boot/wakeup.S b/src/arch/x86/boot/wakeup.S
index a614b55..38d6ea4 100644
--- a/src/arch/x86/boot/wakeup.S
+++ b/src/arch/x86/boot/wakeup.S
@@ -24,7 +24,12 @@
 /* CR0 bits */
 #define PE		(1 << 0)
 
+#ifdef __x86_64__
+	.code64
+#else
 	.code32
+#endif
+
 	.globl __wakeup
 __wakeup:
 	/* First prepare the jmp to the resume vector */
diff --git a/src/arch/x86/include/arch/cpu.h b/src/arch/x86/include/arch/cpu.h
index 851b58d..5c371d9 100644
--- a/src/arch/x86/include/arch/cpu.h
+++ b/src/arch/x86/include/arch/cpu.h
@@ -179,8 +179,14 @@ struct cpu_info {
 static inline struct cpu_info *cpu_info(void)
 {
 	struct cpu_info *ci;
-	__asm__("andl %%esp,%0; "
+	__asm__(
+#ifdef __x86_64__
+		"and %%rsp,%0; "
+		"or  %2, %0 "
+#else
+		"andl %%esp,%0; "
 		"orl  %2, %0 "
+#endif
 		:"=r" (ci)
 		: "0" (~(CONFIG_STACK_SIZE - 1)),
 		"r" (CONFIG_STACK_SIZE - sizeof(struct cpu_info))
diff --git a/src/arch/x86/include/arch/rom_segs.h b/src/arch/x86/include/arch/rom_segs.h
index 8c00eb3..3b3711b 100644
--- a/src/arch/x86/include/arch/rom_segs.h
+++ b/src/arch/x86/include/arch/rom_segs.h
@@ -3,5 +3,6 @@
 
 #define ROM_CODE_SEG 0x08
 #define ROM_DATA_SEG 0x10
+#define ROM_CODE_SEG64 0x18
 
 #endif /* ROM_SEGS_H */
diff --git a/src/arch/x86/include/arch/stages.h b/src/arch/x86/include/arch/stages.h
index 80df8e2..dfdb592 100644
--- a/src/arch/x86/include/arch/stages.h
+++ b/src/arch/x86/include/arch/stages.h
@@ -27,7 +27,11 @@ void asmlinkage copy_and_run(void);
 static inline void stage_exit(void *entry)
 {
 	__asm__ volatile (
+#ifdef __x86_64__
+		"jmp  *%%rdi\n"
+#else
 		"jmp  *%%edi\n"
+#endif
 		:: "D"(entry)
 	);
 }
diff --git a/src/arch/x86/lib/c_start.S b/src/arch/x86/lib/c_start.S
index dbed123..582966b 100644
--- a/src/arch/x86/lib/c_start.S
+++ b/src/arch/x86/lib/c_start.S
@@ -17,20 +17,30 @@ thread_stacks:
 #endif
 
 	.section ".text._start", "ax", @progbits
+#ifdef __x86_64__
+	.code64
+#else
 	.code32
+#endif
 	.globl _start
 	.globl __rmodule_entry
 __rmodule_entry:
 _start:
 	cli
 	lgdt	%cs:gdtaddr
+#ifndef __x86_64__
 	ljmp	$0x10, $1f
+#endif
 1:	movl	$0x18, %eax
 	movl	%eax, %ds
 	movl	%eax, %es
 	movl	%eax, %ss
 	movl	%eax, %fs
 	movl	%eax, %gs
+#ifdef __x86_64__
+	mov     $0x48, %ecx
+	call    SetCodeSelector
+#endif
 
 	post_code(POST_ENTRY_C_START)		/* post 13 */
 
@@ -54,11 +64,11 @@ _start:
 
 #if CONFIG_COOP_MULTITASKING
 	/* Push the thread pointer. */
-	pushl	$0
+	push	$0
 #endif
 	/* Push the cpu index and struct cpu */
-	pushl	$0
-	pushl	$0
+	push	$0
+	push	$0
 
 	/* Initialize the Interrupt Descriptor table */
 	leal	_idt, %edi
@@ -76,7 +86,11 @@ _start:
 	jne	1b
 
 	/* Load the Interrupt descriptor table */
+#ifndef __x86_64__
 	lidt	idtarg
+#else
+	// FIXME port table to x64 - lidt     idtarg
+#endif
 
 	/*
 	 *	Now we are finished. Memory is up, data is copied and
@@ -97,122 +111,150 @@ _start:
 	jmp	.Lhlt
 
 vec0:
-	pushl	$0 /* error code */
-	pushl	$0 /* vector */
+	push	$0 /* error code */
+	push	$0 /* vector */
 	jmp int_hand
 vec1:
-	pushl	$0 /* error code */
-	pushl	$1 /* vector */
+	push	$0 /* error code */
+	push	$1 /* vector */
 	jmp int_hand
 
 vec2:
-	pushl	$0 /* error code */
-	pushl	$2 /* vector */
+	push	$0 /* error code */
+	push	$2 /* vector */
 	jmp int_hand
 
 vec3:
-	pushl	$0 /* error code */
-	pushl	$3 /* vector */
+	push	$0 /* error code */
+	push	$3 /* vector */
 	jmp	int_hand
 
 vec4:
-	pushl	$0 /* error code */
-	pushl	$4 /* vector */
+	push	$0 /* error code */
+	push	$4 /* vector */
 	jmp	int_hand
 
 vec5:
-	pushl	$0 /* error code */
-	pushl	$5 /* vector */
+	push	$0 /* error code */
+	push	$5 /* vector */
 	jmp	int_hand
 
 vec6:
-	pushl	$0 /* error code */
-	pushl	$6 /* vector */
+	push	$0 /* error code */
+	push	$6 /* vector */
 	jmp	int_hand
 
 vec7:
-	pushl	$0 /* error code */
-	pushl	$7 /* vector */
+	push	$0 /* error code */
+	push	$7 /* vector */
 	jmp	int_hand
 
 vec8:
 	/* error code */
-	pushl	$8 /* vector */
+	push	$8 /* vector */
 	jmp	int_hand
 	.word	0x9090
 
 vec9:
-	pushl	$0 /* error code */
-	pushl	$9 /* vector */
+	push	$0 /* error code */
+	push	$9 /* vector */
 	jmp int_hand
 
 vec10:
 	/* error code */
-	pushl	$10 /* vector */
+	push	$10 /* vector */
 	jmp	int_hand
 	.word	0x9090
 
 vec11:
 	/* error code */
-	pushl	$11 /* vector */
+	push	$11 /* vector */
 	jmp	int_hand
 	.word	0x9090
 
 vec12:
 	/* error code */
-	pushl	$12 /* vector */
+	push	$12 /* vector */
 	jmp	int_hand
 	.word	0x9090
 
 vec13:
 	/* error code */
-	pushl	$13 /* vector */
+	push	$13 /* vector */
 	jmp	int_hand
 	.word	0x9090
 
 vec14:
 	/* error code */
-	pushl	$14 /* vector */
+	push	$14 /* vector */
 	jmp	int_hand
 	.word	0x9090
 
 vec15:
-	pushl	$0 /* error code */
-	pushl	$15 /* vector */
+	push	$0 /* error code */
+	push	$15 /* vector */
 	jmp	int_hand
 
 vec16:
-	pushl	$0 /* error code */
-	pushl	$16 /* vector */
+	push	$0 /* error code */
+	push	$16 /* vector */
 	jmp	int_hand
 
 vec17:
 	/* error code */
-	pushl	$17 /* vector */
+	push	$17 /* vector */
 	jmp	int_hand
 	.word	0x9090
 
 vec18:
-	pushl	$0 /* error code */
-	pushl	$18 /* vector */
+	push	$0 /* error code */
+	push	$18 /* vector */
 	jmp	int_hand
 
 vec19:
-	pushl	$0 /* error code */
-	pushl	$19 /* vector */
+	push	$0 /* error code */
+	push	$19 /* vector */
 	jmp	int_hand
 
 int_hand:
-	/* At this point on the stack there is:
+	/* At this point, on x86-32, on the stack there is:
 	 *  0(%esp) vector
 	 *  4(%esp) error code
 	 *  8(%esp) eip
 	 * 12(%esp) cs
 	 * 16(%esp) eflags
 	 */
+#ifdef __x86_64__
+	push	%rdi
+	push	%rsi
+	push	%rbp
+	/* Original stack pointer */
+	lea	32(%rsp), %rbp
+	push	%rbp
+	push	%rbx
+	push	%rdx
+	push	%rcx
+	push	%rax
+
+	push	%rsp	/* Pointer to structure on the stack */
+	call	x86_exception
+	pop	%rax	/* Drop the pointer */
+
+	pop	%rax
+	pop	%rcx
+	pop	%rdx
+	pop	%rbx
+	pop	%rbp	/* Ignore saved %rsp value */
+	pop	%rbp
+	pop	%rsi
+	pop	%rdi
+
+	add	$8, %rsp /* pop of the vector and error code */
+#else
 	pushl	%edi
 	pushl	%esi
 	pushl	%ebp
+
 	/* Original stack pointer */
 	leal	32(%esp), %ebp
 	pushl	%ebp
@@ -235,6 +277,7 @@ int_hand:
 	popl	%edi
 
 	addl	$8, %esp /* pop of the vector and error code */
+#endif
 
 	iret
 
@@ -242,21 +285,33 @@ int_hand:
 
 	.globl gdb_stub_breakpoint
 gdb_stub_breakpoint:
+#ifdef __x86_64__
+	pop	%rax	/* Return address */
+	pushfl
+	push	%cs
+	push	%rax	/* Return address */
+	push	$0	/* No error code */
+	push	$32	/* vector 32 is user defined */
+#else
 	popl	%eax	/* Return address */
 	pushfl
 	pushl	%cs
 	pushl	%eax	/* Return address */
 	pushl	$0	/* No error code */
 	pushl	$32	/* vector 32 is user defined */
+#endif
 	jmp	int_hand
-
 #endif
 
 	.globl gdt, gdt_end, idtarg
 
 gdtaddr:
 	.word	gdt_end - gdt - 1
+#ifdef __x86_64__
+	.quad	gdt
+#else
 	.long	gdt		/* we know the offset */
+#endif
 
 	 .data
 
@@ -287,7 +342,11 @@ gdt:
 
 	/* selgdt 0x18, flat data segment */
 	.word	0xffff, 0x0000
+#ifdef __x86_64__
+	.byte	0x00, 0x92, 0xcf, 0x00
+#else
 	.byte	0x00, 0x93, 0xcf, 0x00
+#endif
 
 	/* selgdt 0x20, unused */
 	.word	0x0000, 0x0000		/* dummy */
@@ -312,6 +371,12 @@ gdt:
 	/* selgdt 0x40, flat code segment 16 bit */
 	.word	0xffff, 0x0000
 	.byte	0x00, 0x9b, 0x8f, 0x00 /* G=1 and 0x0f, So we get 4Gbytes for limit */
+
+#ifdef __x86_64__
+	/* selgdt 0x48, flat x64 code segment */
+	.word	0xffff, 0x0000
+	.byte	0x00, 0x9b, 0xaf, 0x00
+#endif
 gdt_end:
 
 idtarg:
@@ -322,5 +387,35 @@ _idt:
 	.fill	20, 8, 0	# idt is uninitialized
 _idt_end:
 
+#ifdef __x86_64__
+SetCodeSelector:
+.intel_syntax noprefix
+
+       # save rsp because iret will align it to a 16 byte boundary
+       mov     rdx, rsp
+
+       # use iret to jump to a 64-bit offset in a new code segment
+       # iret will pop cs:rip, flags, then ss:rsp
+       mov     ax, ss          # need to push ss..
+       push    rax             # push ss instuction not valid in x64 mode, so use ax
+       push    rsp
+       pushfq
+       push    rcx             # cx is code segment selector from caller
+       mov     rax, offset setCodeSelectorLongJump
+       push    rax
+
+       # the iret will continue at next instruction, with the new cs value loaded
+       iretq
+
+setCodeSelectorLongJump:
+       # restore rsp, it might not have been 16-byte aligned on entry
+       mov      rsp, rdx
+       ret
+.att_syntax prefix
+
+	.previous
+.code64
+#else
 	.previous
 .code32
+#endif
diff --git a/src/arch/x86/lib/cpu.c b/src/arch/x86/lib/cpu.c
index db72695..3eb7b94 100644
--- a/src/arch/x86/lib/cpu.c
+++ b/src/arch/x86/lib/cpu.c
@@ -10,6 +10,7 @@
 #include <device/device.h>
 #include <smp/spinlock.h>
 
+#ifndef __x86_64__
 /* Standard macro to see if a specific flag is changeable */
 static inline int flag_is_changeable_p(uint32_t flag)
 {
@@ -78,6 +79,7 @@ static int deep_magic_nexgen_probe(void)
 		: "=a" (ret) : : "cx", "dx" );
 	return  ret;
 }
+#endif
 
 /* List of cpu vendor strings along with their normalized
  * id values.
@@ -131,6 +133,7 @@ static void identify_cpu(struct device *cpu)
 
 	vendor_name[0] = '\0'; /* Unset */
 
+#ifndef __x86_64__
 	/* Find the id and vendor_name */
 	if (!cpu_have_cpuid()) {
 		/* Its a 486 if we can modify the AC flag */
@@ -148,6 +151,7 @@ static void identify_cpu(struct device *cpu)
 			memcpy(vendor_name, "NexGenDriven", 13);
 		}
 	}
+#endif
 	if (cpu_have_cpuid()) {
 		int  cpuid_level;
 		struct cpuid_result result;
diff --git a/src/arch/x86/lib/cpu_common.c b/src/arch/x86/lib/cpu_common.c
index 6c5561d..af0ab2a 100644
--- a/src/arch/x86/lib/cpu_common.c
+++ b/src/arch/x86/lib/cpu_common.c
@@ -10,6 +10,7 @@
 #include <device/device.h>
 #include <smp/spinlock.h>
 
+#ifndef __x86_64__
 /* Standard macro to see if a specific flag is changeable */
 static inline int flag_is_changeable_p(uint32_t flag)
 {
@@ -37,6 +38,14 @@ int cpu_have_cpuid(void)
 	return flag_is_changeable_p(X86_EFLAGS_ID);
 }
 
+#else
+
+int cpu_have_cpuid(void)
+{
+	return 1;
+}
+#endif
+
 int cpu_cpuid_extended_level(void)
 {
 	return cpuid_eax(0x80000000);
diff --git a/src/arch/x86/lib/ebda.c b/src/arch/x86/lib/ebda.c
index 6089578..47dfbdb 100644
--- a/src/arch/x86/lib/ebda.c
+++ b/src/arch/x86/lib/ebda.c
@@ -40,8 +40,8 @@ void setup_ebda(u32 low_memory_size, u16 ebda_segment, u16 ebda_size)
 	write16(X86_EBDA_SEGMENT, ebda_segment);
 
 	/* Set up EBDA */
-	memset((void *)(ebda_segment << 4), 0, ebda_size);
-	write16((void*)(ebda_segment << 4), (ebda_size >> 10));
+	memset((void *)((uintptr_t)ebda_segment << 4), 0, ebda_size);
+	write16((void*)((uintptr_t)ebda_segment << 4), (ebda_size >> 10));
 }
 
 void setup_default_ebda(void)
diff --git a/src/arch/x86/lib/exception.c b/src/arch/x86/lib/exception.c
index f64b2e7..65181e2 100644
--- a/src/arch/x86/lib/exception.c
+++ b/src/arch/x86/lib/exception.c
@@ -494,16 +494,16 @@ void x86_exception(struct eregs *info)
 		info->error_code, info->eflags,
 		info->eax, info->ebx, info->ecx, info->edx,
 		info->edi, info->esi, info->ebp, info->esp);
-	u8 *code = (u8*)((u32)info->eip - (MDUMP_SIZE >>1));
+	u8 *code = (u8*)((uintptr_t)info->eip - (MDUMP_SIZE >>1));
 	/* Align to 8-byte boundary please, and print eight bytes per row.
 	 * This is done to make DRAM burst timing/reordering errors more
 	 * evident from the looking at the dump */
-	code = (u8*)((u32)code & ~0x7);
+	code = (u8*)((uintptr_t)code & ~0x7);
 	int i;
 	for(i = 0; i < MDUMP_SIZE; i++)
 	{
 		if( (i & 0x07) == 0 )
-			printk(BIOS_EMERG, "\n%.8x:\t", (int)code + i );
+			printk(BIOS_EMERG, "\n%p:\t", code + i);
 		printk(BIOS_EMERG, "%.2x ", code[i]);
 	}
 	die("");
diff --git a/src/arch/x86/lib/pci_ops_mmconf.c b/src/arch/x86/lib/pci_ops_mmconf.c
index 4853f6b..e4fa128 100644
--- a/src/arch/x86/lib/pci_ops_mmconf.c
+++ b/src/arch/x86/lib/pci_ops_mmconf.c
@@ -10,7 +10,7 @@
  */
 
 #define PCI_MMIO_ADDR(SEGBUS, DEVFN, WHERE, MASK)	\
-				((void *)((CONFIG_MMCONF_BASE_ADDRESS |\
+				((void *)(((uintptr_t)CONFIG_MMCONF_BASE_ADDRESS |\
 					   (((SEGBUS) & 0xFFF) << 20) |\
 					   (((DEVFN) & 0xFF) << 12) |\
 					   ((WHERE) & 0xFFF)) & ~MASK))