Core functionality common to interrupt and exception handling (the IDT
for example) has been moved into cpu.c
Signed-off-by: Graeme Russ <[EMAIL PROTECTED]>
---
Future rework on the i386 branch will include support for the SC520 interrupt
controller which can handle up to 22 interrupt lines - Seperating out
exception handling now will make life a lot easier later on
---
cpu/i386/Makefile | 2 +-
cpu/i386/cpu.c | 44 +++++++++
cpu/i386/exceptions.c | 205 +++++++++++++++++++++++++++++++++++++++
cpu/i386/interrupts.c | 209 ----------------------------------------
include/asm-i386/u-boot-i386.h | 3 +
lib_i386/board.c | 3 +-
6 files changed, 255 insertions(+), 211 deletions(-)
create mode 100644 cpu/i386/exceptions.c
diff --git a/cpu/i386/Makefile b/cpu/i386/Makefile
index 761c4f6..f72cd6e 100644
--- a/cpu/i386/Makefile
+++ b/cpu/i386/Makefile
@@ -29,7 +29,7 @@ include $(TOPDIR)/config.mk
LIB = $(obj)lib$(CPU).a
START = start.o start16.o resetvec.o
-COBJS = serial.o interrupts.o cpu.o timer.o
+COBJS = serial.o interrupts.o exceptions.o cpu.o timer.o
SRCS := $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS))
diff --git a/cpu/i386/cpu.c b/cpu/i386/cpu.c
index b9af5f8..70e575c 100644
--- a/cpu/i386/cpu.c
+++ b/cpu/i386/cpu.c
@@ -37,8 +37,30 @@
#include <command.h>
#include <asm/interrupt.h>
+struct idt_entry {
+ u16 base_low;
+ u16 selector;
+ u8 res;
+ u8 access;
+ u16 base_high;
+} __attribute__ ((packed));
+
+#define IDT_SIZE 256
+
+static struct idt_entry idt[IDT_SIZE];
+
+void __attribute__ ((regparm(0))) default_isr(void);
+asm ("default_isr: iret\n");
+
+asm ("idt_ptr:\n"
+ ".word 0x800\n" /* size of the table 8*256 bytes */
+ ".long idt\n" /* offset */
+ ".word 0x18\n"); /* data segment */
+
int cpu_init(void)
{
+ int i;
+
/* initialize FPU, reset EM, set MP and NE */
asm ("fninit\n" \
"movl %cr0, %eax\n" \
@@ -46,9 +68,31 @@ int cpu_init(void)
"orl $0x22, %eax\n" \
"movl %eax, %cr0\n" );
+ /* Just in case... */
+ disable_interrupts();
+
+ /* Setup the IDT */
+ for (i = 0; i < IDT_SIZE; i++) {
+ idt[i].access = 0x8e;
+ idt[i].res = 0;
+ idt[i].selector = 0x10;
+ set_vector(i, default_isr);
+ }
+
+ asm ("cs lidt idt_ptr\n");
+
+ /* It is now safe to enable interrupts */
+ enable_interrupts();
+
return 0;
}
+void set_vector(int intnum, void *routine)
+{
+ idt[intnum].base_high = (u16)((u32)(routine)>>16);
+ idt[intnum].base_low = (u16)((u32)(routine)&0xffff);
+}
+
int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
printf ("resetting ...\n");
diff --git a/cpu/i386/exceptions.c b/cpu/i386/exceptions.c
new file mode 100644
index 0000000..55169b2
--- /dev/null
+++ b/cpu/i386/exceptions.c
@@ -0,0 +1,205 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB, [EMAIL PROTECTED]
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/interrupt.h>
+
+asm ("exp_return:\n"
+ " addl $12, %esp\n"
+ " pop %esp\n"
+ " popa\n"
+ " iret\n");
+
+char exception_stack[4096];
+
+#define DECLARE_EXCEPTION(x, f) \
+ asm(".globl exp_"#x"\n" \
+ "exp_"#x":\n" \
+ "pusha \n" \
+ "movl %esp, %ebx\n" \
+ "movl $exception_stack, %eax\n" \
+ "movl %eax, %esp \n" \
+ "pushl %ebx\n" \
+ "movl 32(%esp), %ebx\n" \
+ "xorl %edx, %edx\n" \
+ "movw 36(%esp), %dx\n" \
+ "pushl %edx\n" \
+ "pushl %ebx\n" \
+ "pushl $"#x"\n" \
+ "pushl $exp_return\n" \
+ "jmp "#f"\n"); \
+ void __attribute__ ((regparm(0))) exp_##x(void)
+
+DECLARE_EXCEPTION(0, divide_exception_entry); /* Divide exception */
+DECLARE_EXCEPTION(1, debug_exception_entry); /* Debug exception */
+DECLARE_EXCEPTION(2, nmi_entry); /* NMI */
+DECLARE_EXCEPTION(3, unknown_exception_entry); /* Breakpoint/Coprocessor
Error */
+DECLARE_EXCEPTION(4, unknown_exception_entry); /* Overflow */
+DECLARE_EXCEPTION(5, unknown_exception_entry); /* Bounds */
+DECLARE_EXCEPTION(6, invalid_instruction_entry); /* Invalid instruction */
+DECLARE_EXCEPTION(7, unknown_exception_entry); /* Device not present */
+DECLARE_EXCEPTION(8, double_fault_entry); /* Double fault */
+DECLARE_EXCEPTION(9, unknown_exception_entry); /* Co-processor segment
overrun */
+DECLARE_EXCEPTION(10, invalid_tss_exception_entry);/* Invalid TSS */
+DECLARE_EXCEPTION(11, seg_fault_entry); /* Segment not present */
+DECLARE_EXCEPTION(12, stack_fault_entry); /* Stack overflow */
+DECLARE_EXCEPTION(13, gpf_entry); /* GPF */
+DECLARE_EXCEPTION(14, page_fault_entry); /* PF */
+DECLARE_EXCEPTION(15, unknown_exception_entry); /* Reserved */
+DECLARE_EXCEPTION(16, fp_exception_entry); /* Floating point */
+DECLARE_EXCEPTION(17, alignment_check_entry); /* alignment check */
+DECLARE_EXCEPTION(18, machine_check_entry); /* machine check */
+DECLARE_EXCEPTION(19, unknown_exception_entry); /* Reserved */
+DECLARE_EXCEPTION(20, unknown_exception_entry); /* Reserved */
+DECLARE_EXCEPTION(21, unknown_exception_entry); /* Reserved */
+DECLARE_EXCEPTION(22, unknown_exception_entry); /* Reserved */
+DECLARE_EXCEPTION(23, unknown_exception_entry); /* Reserved */
+DECLARE_EXCEPTION(24, unknown_exception_entry); /* Reserved */
+DECLARE_EXCEPTION(25, unknown_exception_entry); /* Reserved */
+DECLARE_EXCEPTION(26, unknown_exception_entry); /* Reserved */
+DECLARE_EXCEPTION(27, unknown_exception_entry); /* Reserved */
+DECLARE_EXCEPTION(28, unknown_exception_entry); /* Reserved */
+DECLARE_EXCEPTION(29, unknown_exception_entry); /* Reserved */
+DECLARE_EXCEPTION(30, unknown_exception_entry); /* Reserved */
+DECLARE_EXCEPTION(31, unknown_exception_entry); /* Reserved */
+
+void __attribute__ ((regparm(0))) unknown_exception_entry(int cause, int ip,
int seg)
+{
+ printf("Unknown Exception %d at %04x:%08x\n", cause, seg, ip);
+}
+
+void __attribute__ ((regparm(0))) divide_exception_entry(int cause, int ip,
int seg)
+{
+ printf("Divide Error (Division by zero) at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+void __attribute__ ((regparm(0))) debug_exception_entry(int cause, int ip, int
seg)
+{
+ printf("Debug Interrupt (Single step) at %04x:%08x\n", seg, ip);
+}
+
+void __attribute__ ((regparm(0))) nmi_entry(int cause, int ip, int seg)
+{
+ printf("NMI Interrupt at %04x:%08x\n", seg, ip);
+}
+
+void __attribute__ ((regparm(0))) invalid_instruction_entry(int cause, int ip,
int seg)
+{
+ printf("Invalid Instruction at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+void __attribute__ ((regparm(0))) double_fault_entry(int cause, int ip, int
seg)
+{
+ printf("Double fault at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+void __attribute__ ((regparm(0))) invalid_tss_exception_entry(int cause, int
ip, int seg)
+{
+ printf("Invalid TSS at %04x:%08x\n", seg, ip);
+}
+
+void __attribute__ ((regparm(0))) seg_fault_entry(int cause, int ip, int seg)
+{
+ printf("Segmentation fault at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+void __attribute__ ((regparm(0))) stack_fault_entry(int cause, int ip, int seg)
+{
+ printf("Stack fault at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+void __attribute__ ((regparm(0))) gpf_entry(int cause, int ip, int seg)
+{
+ printf("General protection fault at %04x:%08x\n", seg, ip);
+}
+
+void __attribute__ ((regparm(0))) page_fault_entry(int cause, int ip, int seg)
+{
+ printf("Page fault at %04x:%08x\n", seg, ip);
+ while(1);
+}
+
+void __attribute__ ((regparm(0))) fp_exception_entry(int cause, int ip, int
seg)
+{
+ printf("Floating point exception at %04x:%08x\n", seg, ip);
+}
+
+void __attribute__ ((regparm(0))) alignment_check_entry(int cause, int ip, int
seg)
+{
+ printf("Alignment check at %04x:%08x\n", seg, ip);
+}
+
+void __attribute__ ((regparm(0))) machine_check_entry(int cause, int ip, int
seg)
+{
+ printf("Machine check exception at %04x:%08x\n", seg, ip);
+}
+
+int exception_init(void)
+{
+ /* Just in case... */
+ disable_interrupts();
+
+ /* Setup exceptions */
+ set_vector(0x00, exp_0);
+ set_vector(0x01, exp_1);
+ set_vector(0x02, exp_2);
+ set_vector(0x03, exp_3);
+ set_vector(0x04, exp_4);
+ set_vector(0x05, exp_5);
+ set_vector(0x06, exp_6);
+ set_vector(0x07, exp_7);
+ set_vector(0x08, exp_8);
+ set_vector(0x09, exp_9);
+ set_vector(0x0a, exp_10);
+ set_vector(0x0b, exp_11);
+ set_vector(0x0c, exp_12);
+ set_vector(0x0d, exp_13);
+ set_vector(0x0e, exp_14);
+ set_vector(0x0f, exp_15);
+ set_vector(0x10, exp_16);
+ set_vector(0x11, exp_17);
+ set_vector(0x12, exp_18);
+ set_vector(0x13, exp_19);
+ set_vector(0x14, exp_20);
+ set_vector(0x15, exp_21);
+ set_vector(0x16, exp_22);
+ set_vector(0x17, exp_23);
+ set_vector(0x18, exp_24);
+ set_vector(0x19, exp_25);
+ set_vector(0x1a, exp_26);
+ set_vector(0x1b, exp_27);
+ set_vector(0x1c, exp_28);
+ set_vector(0x1d, exp_29);
+ set_vector(0x1e, exp_30);
+ set_vector(0x1f, exp_31);
+
+ /* It is now safe to enable interrupts */
+ enable_interrupts();
+
+ return 0;
+}
diff --git a/cpu/i386/interrupts.c b/cpu/i386/interrupts.c
index badb30b..1934fb1 100644
--- a/cpu/i386/interrupts.c
+++ b/cpu/i386/interrupts.c
@@ -28,19 +28,6 @@
#include <asm/ibmpc.h>
#include <asm/interrupt.h>
-
-struct idt_entry {
- u16 base_low;
- u16 selector;
- u8 res;
- u8 access;
- u16 base_high;
-} __attribute__ ((packed));
-
-
-struct idt_entry idt[256];
-
-
#define MAX_IRQ 16
typedef struct irq_handler {
@@ -63,14 +50,6 @@ asm ("irq_return:\n"
" popa\n"
" iret\n");
-asm ("exp_return:\n"
- " addl $12, %esp\n"
- " pop %esp\n"
- " popa\n"
- " iret\n");
-
-char exception_stack[4096];
-
#define DECLARE_INTERRUPT(x) \
asm(".globl irq_"#x"\n" \
"irq_"#x":\n" \
@@ -80,57 +59,6 @@ char exception_stack[4096];
"jmp do_irq\n"); \
void __attribute__ ((regparm(0))) irq_##x(void)
-#define DECLARE_EXCEPTION(x, f) \
- asm(".globl exp_"#x"\n" \
- "exp_"#x":\n" \
- "pusha \n" \
- "movl %esp, %ebx\n" \
- "movl $exception_stack, %eax\n" \
- "movl %eax, %esp \n" \
- "pushl %ebx\n" \
- "movl 32(%esp), %ebx\n" \
- "xorl %edx, %edx\n" \
- "movw 36(%esp), %dx\n" \
- "pushl %edx\n" \
- "pushl %ebx\n" \
- "pushl $"#x"\n" \
- "pushl $exp_return\n" \
- "jmp "#f"\n"); \
- void __attribute__ ((regparm(0))) exp_##x(void)
-
-DECLARE_EXCEPTION(0, divide_exception_entry); /* Divide exception */
-DECLARE_EXCEPTION(1, debug_exception_entry); /* Debug exception */
-DECLARE_EXCEPTION(2, nmi_entry); /* NMI */
-DECLARE_EXCEPTION(3, unknown_exception_entry); /* Breakpoint/Coprocessor
Error */
-DECLARE_EXCEPTION(4, unknown_exception_entry); /* Overflow */
-DECLARE_EXCEPTION(5, unknown_exception_entry); /* Bounds */
-DECLARE_EXCEPTION(6, invalid_instruction_entry); /* Invalid instruction */
-DECLARE_EXCEPTION(7, unknown_exception_entry); /* Device not present */
-DECLARE_EXCEPTION(8, double_fault_entry); /* Double fault */
-DECLARE_EXCEPTION(9, unknown_exception_entry); /* Co-processor segment
overrun */
-DECLARE_EXCEPTION(10, invalid_tss_exception_entry);/* Invalid TSS */
-DECLARE_EXCEPTION(11, seg_fault_entry); /* Segment not present */
-DECLARE_EXCEPTION(12, stack_fault_entry); /* Stack overflow */
-DECLARE_EXCEPTION(13, gpf_entry); /* GPF */
-DECLARE_EXCEPTION(14, page_fault_entry); /* PF */
-DECLARE_EXCEPTION(15, unknown_exception_entry); /* Reserved */
-DECLARE_EXCEPTION(16, fp_exception_entry); /* Floating point */
-DECLARE_EXCEPTION(17, alignment_check_entry); /* alignment check */
-DECLARE_EXCEPTION(18, machine_check_entry); /* machine check */
-DECLARE_EXCEPTION(19, unknown_exception_entry); /* Reserved */
-DECLARE_EXCEPTION(20, unknown_exception_entry); /* Reserved */
-DECLARE_EXCEPTION(21, unknown_exception_entry); /* Reserved */
-DECLARE_EXCEPTION(22, unknown_exception_entry); /* Reserved */
-DECLARE_EXCEPTION(23, unknown_exception_entry); /* Reserved */
-DECLARE_EXCEPTION(24, unknown_exception_entry); /* Reserved */
-DECLARE_EXCEPTION(25, unknown_exception_entry); /* Reserved */
-DECLARE_EXCEPTION(26, unknown_exception_entry); /* Reserved */
-DECLARE_EXCEPTION(27, unknown_exception_entry); /* Reserved */
-DECLARE_EXCEPTION(28, unknown_exception_entry); /* Reserved */
-DECLARE_EXCEPTION(29, unknown_exception_entry); /* Reserved */
-DECLARE_EXCEPTION(30, unknown_exception_entry); /* Reserved */
-DECLARE_EXCEPTION(31, unknown_exception_entry); /* Reserved */
-
DECLARE_INTERRUPT(0);
DECLARE_INTERRUPT(1);
DECLARE_INTERRUPT(3);
@@ -147,9 +75,6 @@ DECLARE_INTERRUPT(13);
DECLARE_INTERRUPT(14);
DECLARE_INTERRUPT(15);
-void __attribute__ ((regparm(0))) default_isr(void);
-asm ("default_isr: iret\n");
-
void disable_irq(int irq)
{
if (irq >= MAX_IRQ) {
@@ -242,84 +167,6 @@ void __attribute__ ((regparm(0))) do_irq(int irq)
specific_eoi(irq);
}
-
-void __attribute__ ((regparm(0))) unknown_exception_entry(int cause, int ip,
int seg)
-{
- printf("Unknown Exception %d at %04x:%08x\n", cause, seg, ip);
-}
-
-void __attribute__ ((regparm(0))) divide_exception_entry(int cause, int ip,
int seg)
-{
- printf("Divide Error (Division by zero) at %04x:%08x\n", seg, ip);
- while(1);
-}
-
-void __attribute__ ((regparm(0))) debug_exception_entry(int cause, int ip, int
seg)
-{
- printf("Debug Interrupt (Single step) at %04x:%08x\n", seg, ip);
-}
-
-void __attribute__ ((regparm(0))) nmi_entry(int cause, int ip, int seg)
-{
- printf("NMI Interrupt at %04x:%08x\n", seg, ip);
-}
-
-void __attribute__ ((regparm(0))) invalid_instruction_entry(int cause, int ip,
int seg)
-{
- printf("Invalid Instruction at %04x:%08x\n", seg, ip);
- while(1);
-}
-
-void __attribute__ ((regparm(0))) double_fault_entry(int cause, int ip, int
seg)
-{
- printf("Double fault at %04x:%08x\n", seg, ip);
- while(1);
-}
-
-void __attribute__ ((regparm(0))) invalid_tss_exception_entry(int cause, int
ip, int seg)
-{
- printf("Invalid TSS at %04x:%08x\n", seg, ip);
-}
-
-void __attribute__ ((regparm(0))) seg_fault_entry(int cause, int ip, int seg)
-{
- printf("Segmentation fault at %04x:%08x\n", seg, ip);
- while(1);
-}
-
-void __attribute__ ((regparm(0))) stack_fault_entry(int cause, int ip, int seg)
-{
- printf("Stack fault at %04x:%08x\n", seg, ip);
- while(1);
-}
-
-void __attribute__ ((regparm(0))) gpf_entry(int cause, int ip, int seg)
-{
- printf("General protection fault at %04x:%08x\n", seg, ip);
-}
-
-void __attribute__ ((regparm(0))) page_fault_entry(int cause, int ip, int seg)
-{
- printf("Page fault at %04x:%08x\n", seg, ip);
- while(1);
-}
-
-void __attribute__ ((regparm(0))) fp_exception_entry(int cause, int ip, int
seg)
-{
- printf("Floating point exception at %04x:%08x\n", seg, ip);
-}
-
-void __attribute__ ((regparm(0))) alignment_check_entry(int cause, int ip, int
seg)
-{
- printf("Alignment check at %04x:%08x\n", seg, ip);
-}
-
-void __attribute__ ((regparm(0))) machine_check_entry(int cause, int ip, int
seg)
-{
- printf("Machine check exception at %04x:%08x\n", seg, ip);
-}
-
-
void irq_install_handler(int ino, interrupt_handler_t *func, void *pdata)
{
int status;
@@ -371,19 +218,6 @@ void irq_free_handler(int ino)
return;
}
-
-asm ("idt_ptr:\n"
- ".word 0x800\n" /* size of the table 8*256 bytes */
- ".long idt\n" /* offset */
- ".word 0x18\n");/* data segment */
-
-void set_vector(int intnum, void *routine)
-{
- idt[intnum].base_high = (u16)((u32)(routine)>>16);
- idt[intnum].base_low = (u16)((u32)(routine)&0xffff);
-}
-
-
int interrupt_init(void)
{
int i;
@@ -396,49 +230,6 @@ int interrupt_init(void)
memset(irq_table, 0, sizeof(irq_table));
- /* Setup the IDT */
- for (i=0;i<256;i++) {
- idt[i].access = 0x8e;
- idt[i].res = 0;
- idt[i].selector = 0x10;
- set_vector(i, default_isr);
- }
-
- asm ("cs lidt idt_ptr\n");
-
- /* Setup exceptions */
- set_vector(0x00, exp_0);
- set_vector(0x01, exp_1);
- set_vector(0x02, exp_2);
- set_vector(0x03, exp_3);
- set_vector(0x04, exp_4);
- set_vector(0x05, exp_5);
- set_vector(0x06, exp_6);
- set_vector(0x07, exp_7);
- set_vector(0x08, exp_8);
- set_vector(0x09, exp_9);
- set_vector(0x0a, exp_10);
- set_vector(0x0b, exp_11);
- set_vector(0x0c, exp_12);
- set_vector(0x0d, exp_13);
- set_vector(0x0e, exp_14);
- set_vector(0x0f, exp_15);
- set_vector(0x10, exp_16);
- set_vector(0x11, exp_17);
- set_vector(0x12, exp_18);
- set_vector(0x13, exp_19);
- set_vector(0x14, exp_20);
- set_vector(0x15, exp_21);
- set_vector(0x16, exp_22);
- set_vector(0x17, exp_23);
- set_vector(0x18, exp_24);
- set_vector(0x19, exp_25);
- set_vector(0x1a, exp_26);
- set_vector(0x1b, exp_27);
- set_vector(0x1c, exp_28);
- set_vector(0x1d, exp_29);
- set_vector(0x1e, exp_30);
- set_vector(0x1f, exp_31);
/* Setup interrupts */
diff --git a/include/asm-i386/u-boot-i386.h b/include/asm-i386/u-boot-i386.h
index 12d10a7..8d079ae 100644
--- a/include/asm-i386/u-boot-i386.h
+++ b/include/asm-i386/u-boot-i386.h
@@ -45,6 +45,9 @@ extern ulong i386boot_bios_size; /* size of BIOS emulation
code */
int cpu_init(void);
int timer_init(void);
+/* cpu/.../exceptions.c */
+int exception_init(void);
+
/* board/.../... */
int board_init(void);
int dram_init(void);
diff --git a/lib_i386/board.c b/lib_i386/board.c
index 659f9a2..ee7d794 100644
--- a/lib_i386/board.c
+++ b/lib_i386/board.c
@@ -201,7 +201,8 @@ init_fnc_t *init_sequence[] = {
board_init, /* basic board dependent setup */
dram_init, /* configure available RAM banks */
mem_malloc_init, /* dependant on dram_init */
- interrupt_init, /* set up exceptions */
+ interrupt_init, /* set up interrupts */
+ exception_init, /* set up exceptions */
timer_init,
serial_init,
env_init, /* initialize environment */
--
1.5.4.3
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