diff options
Diffstat (limited to 'arch/cris/arch-v10/kernel/irq.c')
| -rw-r--r-- | arch/cris/arch-v10/kernel/irq.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/arch/cris/arch-v10/kernel/irq.c b/arch/cris/arch-v10/kernel/irq.c new file mode 100644 index 000000000000..b2f16d6fc871 --- /dev/null +++ b/arch/cris/arch-v10/kernel/irq.c @@ -0,0 +1,204 @@ +/* $Id: irq.c,v 1.2 2004/06/09 05:30:27 starvik Exp $ + * + * linux/arch/cris/kernel/irq.c + * + * Copyright (c) 2000-2002 Axis Communications AB + * + * Authors: Bjorn Wesen (bjornw@axis.com) + * + * This file contains the interrupt vectors and some + * helper functions + * + */ + +#include <asm/irq.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/config.h> + +irqvectptr irq_shortcuts[NR_IRQS]; /* vector of shortcut jumps after the irq prologue */ + +/* don't use set_int_vector, it bypasses the linux interrupt handlers. it is + * global just so that the kernel gdb can use it. + */ + +void +set_int_vector(int n, irqvectptr addr) +{ + etrax_irv->v[n + 0x20] = (irqvectptr)addr; +} + +/* the breakpoint vector is obviously not made just like the normal irq handlers + * but needs to contain _code_ to jump to addr. + * + * the BREAK n instruction jumps to IBR + n * 8 + */ + +void +set_break_vector(int n, irqvectptr addr) +{ + unsigned short *jinstr = (unsigned short *)&etrax_irv->v[n*2]; + unsigned long *jaddr = (unsigned long *)(jinstr + 1); + + /* if you don't know what this does, do not touch it! */ + + *jinstr = 0x0d3f; + *jaddr = (unsigned long)addr; + + /* 00000026 <clrlop+1a> 3f0d82000000 jump 0x82 */ +} + +/* + * This builds up the IRQ handler stubs using some ugly macros in irq.h + * + * These macros create the low-level assembly IRQ routines that do all + * the operations that are needed. They are also written to be fast - and to + * disable interrupts as little as humanly possible. + * + */ + +/* IRQ0 and 1 are special traps */ +void hwbreakpoint(void); +void IRQ1_interrupt(void); +BUILD_TIMER_IRQ(2, 0x04) /* the timer interrupt is somewhat special */ +BUILD_IRQ(3, 0x08) +BUILD_IRQ(4, 0x10) +BUILD_IRQ(5, 0x20) +BUILD_IRQ(6, 0x40) +BUILD_IRQ(7, 0x80) +BUILD_IRQ(8, 0x100) +BUILD_IRQ(9, 0x200) +BUILD_IRQ(10, 0x400) +BUILD_IRQ(11, 0x800) +BUILD_IRQ(12, 0x1000) +BUILD_IRQ(13, 0x2000) +void mmu_bus_fault(void); /* IRQ 14 is the bus fault interrupt */ +void multiple_interrupt(void); /* IRQ 15 is the multiple IRQ interrupt */ +BUILD_IRQ(16, 0x10000) +BUILD_IRQ(17, 0x20000) +BUILD_IRQ(18, 0x40000) +BUILD_IRQ(19, 0x80000) +BUILD_IRQ(20, 0x100000) +BUILD_IRQ(21, 0x200000) +BUILD_IRQ(22, 0x400000) +BUILD_IRQ(23, 0x800000) +BUILD_IRQ(24, 0x1000000) +BUILD_IRQ(25, 0x2000000) +/* IRQ 26-30 are reserved */ +BUILD_IRQ(31, 0x80000000) + +/* + * Pointers to the low-level handlers + */ + +static void (*interrupt[NR_IRQS])(void) = { + NULL, NULL, IRQ2_interrupt, IRQ3_interrupt, + IRQ4_interrupt, IRQ5_interrupt, IRQ6_interrupt, IRQ7_interrupt, + IRQ8_interrupt, IRQ9_interrupt, IRQ10_interrupt, IRQ11_interrupt, + IRQ12_interrupt, IRQ13_interrupt, NULL, NULL, + IRQ16_interrupt, IRQ17_interrupt, IRQ18_interrupt, IRQ19_interrupt, + IRQ20_interrupt, IRQ21_interrupt, IRQ22_interrupt, IRQ23_interrupt, + IRQ24_interrupt, IRQ25_interrupt, NULL, NULL, NULL, NULL, NULL, + IRQ31_interrupt +}; + +static void (*bad_interrupt[NR_IRQS])(void) = { + NULL, NULL, + NULL, bad_IRQ3_interrupt, + bad_IRQ4_interrupt, bad_IRQ5_interrupt, + bad_IRQ6_interrupt, bad_IRQ7_interrupt, + bad_IRQ8_interrupt, bad_IRQ9_interrupt, + bad_IRQ10_interrupt, bad_IRQ11_interrupt, + bad_IRQ12_interrupt, bad_IRQ13_interrupt, + NULL, NULL, + bad_IRQ16_interrupt, bad_IRQ17_interrupt, + bad_IRQ18_interrupt, bad_IRQ19_interrupt, + bad_IRQ20_interrupt, bad_IRQ21_interrupt, + bad_IRQ22_interrupt, bad_IRQ23_interrupt, + bad_IRQ24_interrupt, bad_IRQ25_interrupt, + NULL, NULL, NULL, NULL, NULL, + bad_IRQ31_interrupt +}; + +void arch_setup_irq(int irq) +{ + set_int_vector(irq, interrupt[irq]); +} + +void arch_free_irq(int irq) +{ + set_int_vector(irq, bad_interrupt[irq]); +} + +void weird_irq(void); +void system_call(void); /* from entry.S */ +void do_sigtrap(void); /* from entry.S */ +void gdb_handle_breakpoint(void); /* from entry.S */ + +/* init_IRQ() is called by start_kernel and is responsible for fixing IRQ masks and + setting the irq vector table to point to bad_interrupt ptrs. +*/ + +void __init +init_IRQ(void) +{ + int i; + + /* clear all interrupt masks */ + +#ifndef CONFIG_SVINTO_SIM + *R_IRQ_MASK0_CLR = 0xffffffff; + *R_IRQ_MASK1_CLR = 0xffffffff; + *R_IRQ_MASK2_CLR = 0xffffffff; +#endif + + *R_VECT_MASK_CLR = 0xffffffff; + + /* clear the shortcut entry points */ + + for(i = 0; i < NR_IRQS; i++) + irq_shortcuts[i] = NULL; + + for (i = 0; i < 256; i++) + etrax_irv->v[i] = weird_irq; + + /* the entries in the break vector contain actual code to be + executed by the associated break handler, rather than just a jump + address. therefore we need to setup a default breakpoint handler + for all breakpoints */ + + for (i = 0; i < 16; i++) + set_break_vector(i, do_sigtrap); + + /* set all etrax irq's to the bad handlers */ + for (i = 2; i < NR_IRQS; i++) + set_int_vector(i, bad_interrupt[i]); + + /* except IRQ 15 which is the multiple-IRQ handler on Etrax100 */ + + set_int_vector(15, multiple_interrupt); + + /* 0 and 1 which are special breakpoint/NMI traps */ + + set_int_vector(0, hwbreakpoint); + set_int_vector(1, IRQ1_interrupt); + + /* and irq 14 which is the mmu bus fault handler */ + + set_int_vector(14, mmu_bus_fault); + + /* setup the system-call trap, which is reached by BREAK 13 */ + + set_break_vector(13, system_call); + + /* setup a breakpoint handler for debugging used for both user and + kernel mode debugging (which is why it is not inside an ifdef + CONFIG_ETRAX_KGDB) */ + set_break_vector(8, gdb_handle_breakpoint); + +#ifdef CONFIG_ETRAX_KGDB + /* setup kgdb if its enabled, and break into the debugger */ + kgdb_init(); + breakpoint(); +#endif +} |