mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-10 05:06:16 +09:00
3f5f18d12d
Moved from interrupts.c to cpu.c and made into a weak function to allow vendor specific override Vendor specific CPU reset (like the AMD SC520 MMCR reset) can now be added to the vendor specific code without the need to remember to #undef usage of the generic method and if you forget to include your custom reset method, you will always get the default. Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
511 lines
12 KiB
C
511 lines
12 KiB
C
/*
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* (C) Copyright 2002
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* Daniel Engström, Omicron Ceti AB, daniel@omicron.se.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <malloc.h>
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#include <asm/io.h>
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#include <asm/i8259.h>
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#include <asm/ibmpc.h>
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#include <asm/interrupt.h>
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struct idt_entry {
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u16 base_low;
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u16 selector;
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u8 res;
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u8 access;
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u16 base_high;
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} __attribute__ ((packed));
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struct idt_entry idt[256];
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#define MAX_IRQ 16
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typedef struct irq_handler {
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struct irq_handler *next;
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interrupt_handler_t* isr_func;
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void *isr_data;
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} irq_handler_t;
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#define IRQ_DISABLED 1
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typedef struct {
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irq_handler_t *handler;
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unsigned long status;
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} irq_desc_t;
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static irq_desc_t irq_table[MAX_IRQ];
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asm ("irq_return:\n"
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" addl $4, %esp\n"
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" popa\n"
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" iret\n");
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asm ("exp_return:\n"
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" addl $12, %esp\n"
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" pop %esp\n"
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" popa\n"
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" iret\n");
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char exception_stack[4096];
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#define DECLARE_INTERRUPT(x) \
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asm(".globl irq_"#x"\n" \
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"irq_"#x":\n" \
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"pusha \n" \
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"pushl $"#x"\n" \
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"pushl $irq_return\n" \
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"jmp do_irq\n"); \
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void __attribute__ ((regparm(0))) irq_##x(void)
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#define DECLARE_EXCEPTION(x, f) \
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asm(".globl exp_"#x"\n" \
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"exp_"#x":\n" \
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"pusha \n" \
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"movl %esp, %ebx\n" \
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"movl $exception_stack, %eax\n" \
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"movl %eax, %esp \n" \
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"pushl %ebx\n" \
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"movl 32(%esp), %ebx\n" \
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"xorl %edx, %edx\n" \
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"movw 36(%esp), %dx\n" \
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"pushl %edx\n" \
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"pushl %ebx\n" \
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"pushl $"#x"\n" \
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"pushl $exp_return\n" \
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"jmp "#f"\n"); \
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void __attribute__ ((regparm(0))) exp_##x(void)
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DECLARE_EXCEPTION(0, divide_exception_entry); /* Divide exception */
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DECLARE_EXCEPTION(1, debug_exception_entry); /* Debug exception */
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DECLARE_EXCEPTION(2, nmi_entry); /* NMI */
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DECLARE_EXCEPTION(3, unknown_exception_entry); /* Breakpoint/Coprocessor Error */
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DECLARE_EXCEPTION(4, unknown_exception_entry); /* Overflow */
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DECLARE_EXCEPTION(5, unknown_exception_entry); /* Bounds */
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DECLARE_EXCEPTION(6, invalid_instruction_entry); /* Invalid instruction */
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DECLARE_EXCEPTION(7, unknown_exception_entry); /* Device not present */
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DECLARE_EXCEPTION(8, double_fault_entry); /* Double fault */
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DECLARE_EXCEPTION(9, unknown_exception_entry); /* Co-processor segment overrun */
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DECLARE_EXCEPTION(10, invalid_tss_exception_entry);/* Invalid TSS */
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DECLARE_EXCEPTION(11, seg_fault_entry); /* Segment not present */
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DECLARE_EXCEPTION(12, stack_fault_entry); /* Stack overflow */
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DECLARE_EXCEPTION(13, gpf_entry); /* GPF */
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DECLARE_EXCEPTION(14, page_fault_entry); /* PF */
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DECLARE_EXCEPTION(15, unknown_exception_entry); /* Reserved */
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DECLARE_EXCEPTION(16, fp_exception_entry); /* Floating point */
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DECLARE_EXCEPTION(17, alignment_check_entry); /* alignment check */
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DECLARE_EXCEPTION(18, machine_check_entry); /* machine check */
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DECLARE_EXCEPTION(19, unknown_exception_entry); /* Reserved */
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DECLARE_EXCEPTION(20, unknown_exception_entry); /* Reserved */
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DECLARE_EXCEPTION(21, unknown_exception_entry); /* Reserved */
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DECLARE_EXCEPTION(22, unknown_exception_entry); /* Reserved */
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DECLARE_EXCEPTION(23, unknown_exception_entry); /* Reserved */
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DECLARE_EXCEPTION(24, unknown_exception_entry); /* Reserved */
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DECLARE_EXCEPTION(25, unknown_exception_entry); /* Reserved */
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DECLARE_EXCEPTION(26, unknown_exception_entry); /* Reserved */
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DECLARE_EXCEPTION(27, unknown_exception_entry); /* Reserved */
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DECLARE_EXCEPTION(28, unknown_exception_entry); /* Reserved */
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DECLARE_EXCEPTION(29, unknown_exception_entry); /* Reserved */
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DECLARE_EXCEPTION(30, unknown_exception_entry); /* Reserved */
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DECLARE_EXCEPTION(31, unknown_exception_entry); /* Reserved */
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DECLARE_INTERRUPT(0);
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DECLARE_INTERRUPT(1);
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DECLARE_INTERRUPT(3);
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DECLARE_INTERRUPT(4);
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DECLARE_INTERRUPT(5);
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DECLARE_INTERRUPT(6);
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DECLARE_INTERRUPT(7);
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DECLARE_INTERRUPT(8);
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DECLARE_INTERRUPT(9);
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DECLARE_INTERRUPT(10);
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DECLARE_INTERRUPT(11);
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DECLARE_INTERRUPT(12);
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DECLARE_INTERRUPT(13);
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DECLARE_INTERRUPT(14);
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DECLARE_INTERRUPT(15);
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void __attribute__ ((regparm(0))) default_isr(void);
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asm ("default_isr: iret\n");
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void disable_irq(int irq)
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{
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if (irq >= MAX_IRQ) {
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return;
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}
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irq_table[irq].status |= IRQ_DISABLED;
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}
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void enable_irq(int irq)
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{
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if (irq >= MAX_IRQ) {
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return;
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}
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irq_table[irq].status &= ~IRQ_DISABLED;
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}
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/* masks one specific IRQ in the PIC */
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static void unmask_irq(int irq)
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{
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int imr_port;
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if (irq >= MAX_IRQ) {
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return;
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}
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if (irq > 7) {
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imr_port = SLAVE_PIC + IMR;
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} else {
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imr_port = MASTER_PIC + IMR;
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}
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outb(inb(imr_port)&~(1<<(irq&7)), imr_port);
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}
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/* unmasks one specific IRQ in the PIC */
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static void mask_irq(int irq)
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{
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int imr_port;
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if (irq >= MAX_IRQ) {
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return;
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}
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if (irq > 7) {
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imr_port = SLAVE_PIC + IMR;
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} else {
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imr_port = MASTER_PIC + IMR;
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}
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outb(inb(imr_port)|(1<<(irq&7)), imr_port);
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}
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/* issue a Specific End Of Interrupt instruciton */
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static void specific_eoi(int irq)
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{
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/* If it is on the slave PIC this have to be performed on
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* both the master and the slave PICs */
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if (irq > 7) {
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outb(OCW2_SEOI|(irq&7), SLAVE_PIC + OCW2);
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irq = SEOI_IR2; /* also do IR2 on master */
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}
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outb(OCW2_SEOI|irq, MASTER_PIC + OCW2);
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}
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void __attribute__ ((regparm(0))) do_irq(int irq)
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{
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mask_irq(irq);
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if (irq_table[irq].status & IRQ_DISABLED) {
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unmask_irq(irq);
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specific_eoi(irq);
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return;
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}
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if (NULL != irq_table[irq].handler) {
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irq_handler_t *handler;
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for (handler = irq_table[irq].handler;
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NULL!= handler; handler = handler->next) {
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handler->isr_func(handler->isr_data);
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}
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} else {
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if ((irq & 7) != 7) {
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printf("Spurious irq %d\n", irq);
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}
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}
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unmask_irq(irq);
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specific_eoi(irq);
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}
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void __attribute__ ((regparm(0))) unknown_exception_entry(int cause, int ip, int seg)
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{
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printf("Unknown Exception %d at %04x:%08x\n", cause, seg, ip);
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}
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void __attribute__ ((regparm(0))) divide_exception_entry(int cause, int ip, int seg)
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{
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printf("Divide Error (Division by zero) at %04x:%08x\n", seg, ip);
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while(1);
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}
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void __attribute__ ((regparm(0))) debug_exception_entry(int cause, int ip, int seg)
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{
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printf("Debug Interrupt (Single step) at %04x:%08x\n", seg, ip);
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}
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void __attribute__ ((regparm(0))) nmi_entry(int cause, int ip, int seg)
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{
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printf("NMI Interrupt at %04x:%08x\n", seg, ip);
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}
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void __attribute__ ((regparm(0))) invalid_instruction_entry(int cause, int ip, int seg)
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{
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printf("Invalid Instruction at %04x:%08x\n", seg, ip);
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while(1);
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}
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void __attribute__ ((regparm(0))) double_fault_entry(int cause, int ip, int seg)
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{
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printf("Double fault at %04x:%08x\n", seg, ip);
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while(1);
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}
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void __attribute__ ((regparm(0))) invalid_tss_exception_entry(int cause, int ip, int seg)
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{
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printf("Invalid TSS at %04x:%08x\n", seg, ip);
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}
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void __attribute__ ((regparm(0))) seg_fault_entry(int cause, int ip, int seg)
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{
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printf("Segmentation fault at %04x:%08x\n", seg, ip);
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while(1);
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}
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void __attribute__ ((regparm(0))) stack_fault_entry(int cause, int ip, int seg)
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{
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printf("Stack fault at %04x:%08x\n", seg, ip);
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while(1);
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}
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void __attribute__ ((regparm(0))) gpf_entry(int cause, int ip, int seg)
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{
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printf("General protection fault at %04x:%08x\n", seg, ip);
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}
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void __attribute__ ((regparm(0))) page_fault_entry(int cause, int ip, int seg)
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{
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printf("Page fault at %04x:%08x\n", seg, ip);
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while(1);
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}
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void __attribute__ ((regparm(0))) fp_exception_entry(int cause, int ip, int seg)
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{
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printf("Floating point exception at %04x:%08x\n", seg, ip);
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}
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void __attribute__ ((regparm(0))) alignment_check_entry(int cause, int ip, int seg)
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{
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printf("Alignment check at %04x:%08x\n", seg, ip);
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}
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void __attribute__ ((regparm(0))) machine_check_entry(int cause, int ip, int seg)
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{
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printf("Machine check exception at %04x:%08x\n", seg, ip);
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}
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void irq_install_handler(int ino, interrupt_handler_t *func, void *pdata)
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{
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int status;
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if (ino>MAX_IRQ) {
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return;
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}
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if (NULL != irq_table[ino].handler) {
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return;
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}
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status = disable_interrupts();
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irq_table[ino].handler = malloc(sizeof(irq_handler_t));
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if (NULL == irq_table[ino].handler) {
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return;
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}
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memset(irq_table[ino].handler, 0, sizeof(irq_handler_t));
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irq_table[ino].handler->isr_func = func;
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irq_table[ino].handler->isr_data = pdata;
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if (status) {
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enable_interrupts();
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}
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unmask_irq(ino);
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return;
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}
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void irq_free_handler(int ino)
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{
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int status;
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if (ino>MAX_IRQ) {
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return;
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}
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status = disable_interrupts();
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mask_irq(ino);
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if (NULL == irq_table[ino].handler) {
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return;
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}
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free(irq_table[ino].handler);
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irq_table[ino].handler=NULL;
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if (status) {
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enable_interrupts();
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}
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return;
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}
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asm ("idt_ptr:\n"
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".word 0x800\n" /* size of the table 8*256 bytes */
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".long idt\n" /* offset */
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".word 0x18\n");/* data segment */
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void set_vector(int intnum, void *routine)
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{
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idt[intnum].base_high = (u16)((u32)(routine)>>16);
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idt[intnum].base_low = (u16)((u32)(routine)&0xffff);
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}
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int interrupt_init(void)
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{
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int i;
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/* Just in case... */
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disable_interrupts();
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/* Initialize the IDT and stuff */
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memset(irq_table, 0, sizeof(irq_table));
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/* Setup the IDT */
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for (i=0;i<256;i++) {
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idt[i].access = 0x8e;
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idt[i].res = 0;
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idt[i].selector = 0x10;
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set_vector(i, default_isr);
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}
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asm ("cs lidt idt_ptr\n");
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/* Setup exceptions */
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set_vector(0x00, exp_0);
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set_vector(0x01, exp_1);
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set_vector(0x02, exp_2);
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set_vector(0x03, exp_3);
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set_vector(0x04, exp_4);
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set_vector(0x05, exp_5);
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set_vector(0x06, exp_6);
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set_vector(0x07, exp_7);
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set_vector(0x08, exp_8);
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set_vector(0x09, exp_9);
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set_vector(0x0a, exp_10);
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set_vector(0x0b, exp_11);
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set_vector(0x0c, exp_12);
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set_vector(0x0d, exp_13);
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set_vector(0x0e, exp_14);
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set_vector(0x0f, exp_15);
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set_vector(0x10, exp_16);
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set_vector(0x11, exp_17);
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set_vector(0x12, exp_18);
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set_vector(0x13, exp_19);
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set_vector(0x14, exp_20);
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set_vector(0x15, exp_21);
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set_vector(0x16, exp_22);
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set_vector(0x17, exp_23);
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set_vector(0x18, exp_24);
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set_vector(0x19, exp_25);
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set_vector(0x1a, exp_26);
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set_vector(0x1b, exp_27);
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set_vector(0x1c, exp_28);
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set_vector(0x1d, exp_29);
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set_vector(0x1e, exp_30);
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set_vector(0x1f, exp_31);
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/* Setup interrupts */
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set_vector(0x20, irq_0);
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set_vector(0x21, irq_1);
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set_vector(0x23, irq_3);
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set_vector(0x24, irq_4);
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set_vector(0x25, irq_5);
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set_vector(0x26, irq_6);
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set_vector(0x27, irq_7);
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set_vector(0x28, irq_8);
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set_vector(0x29, irq_9);
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set_vector(0x2a, irq_10);
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set_vector(0x2b, irq_11);
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set_vector(0x2c, irq_12);
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set_vector(0x2d, irq_13);
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set_vector(0x2e, irq_14);
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set_vector(0x2f, irq_15);
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/* vectors 0x30-0x3f are reserved for irq 16-31 */
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/* Mask all interrupts */
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outb(0xff, MASTER_PIC + IMR);
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outb(0xff, SLAVE_PIC + IMR);
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/* Master PIC */
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outb(ICW1_SEL|ICW1_EICW4, MASTER_PIC + ICW1);
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outb(0x20, MASTER_PIC + ICW2); /* Place master PIC interrupts at INT20 */
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outb(IR2, MASTER_PIC + ICW3); /* ICW3, One slevc PIC is present */
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outb(ICW4_PM, MASTER_PIC + ICW4);
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for (i=0;i<8;i++) {
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outb(OCW2_SEOI|i, MASTER_PIC + OCW2);
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}
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/* Slave PIC */
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outb(ICW1_SEL|ICW1_EICW4, SLAVE_PIC + ICW1);
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outb(0x28, SLAVE_PIC + ICW2); /* Place slave PIC interrupts at INT28 */
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outb(0x02, SLAVE_PIC + ICW3); /* Slave ID */
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outb(ICW4_PM, SLAVE_PIC + ICW4);
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for (i=0;i<8;i++) {
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outb(OCW2_SEOI|i, SLAVE_PIC + OCW2);
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}
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/* enable cascade interrerupt */
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outb(0xfb, MASTER_PIC + IMR);
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outb(0xff, SLAVE_PIC + IMR);
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/* It is now safe to enable interrupts */
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enable_interrupts();
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return 0;
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}
|
|
|
|
void enable_interrupts(void)
|
|
{
|
|
asm("sti\n");
|
|
}
|
|
|
|
int disable_interrupts(void)
|
|
{
|
|
long flags;
|
|
|
|
asm volatile ("pushfl ; popl %0 ; cli\n" : "=g" (flags) : );
|
|
|
|
return (flags&0x200); /* IE flags is bit 9 */
|
|
}
|