diff options
Diffstat (limited to 'target/linux/adm5120-2.6/files/arch/mips/adm5120/int-handler.S')
| -rw-r--r-- | target/linux/adm5120-2.6/files/arch/mips/adm5120/int-handler.S | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/target/linux/adm5120-2.6/files/arch/mips/adm5120/int-handler.S b/target/linux/adm5120-2.6/files/arch/mips/adm5120/int-handler.S deleted file mode 100644 index f118fb402b..0000000000 --- a/target/linux/adm5120-2.6/files/arch/mips/adm5120/int-handler.S +++ /dev/null @@ -1,135 +0,0 @@ -/* - * Carsten Langgaard, carstenl@mips.com - * Copyright (C) 1999, 2000 MIPS Technologies, Inc. All rights reserved. - * - * ######################################################################## - * - * This program is free software; you can distribute it and/or modify it - * under the terms of the GNU General Public License (Version 2) as - * published by the Free Software Foundation. - * - * This program is distributed in the hope 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. - * - * ######################################################################## - * - * Interrupt exception dispatch code. - * - */ -#include <linux/autoconf.h> - -#include <asm/asm.h> -#include <asm/mipsregs.h> -#include <asm/regdef.h> -#include <asm/stackframe.h> - -#define STATUS_IE 0x00000001 - -/* A lot of complication here is taken away because: - * - * 1) We handle one interrupt and return, sitting in a loop and moving across - * all the pending IRQ bits in the cause register is _NOT_ the answer, the - * common case is one pending IRQ so optimize in that direction. - * - * 2) We need not check against bits in the status register IRQ mask, that - * would make this routine slow as hell. - * - * 3) Linux only thinks in terms of all IRQs on or all IRQs off, nothing in - * between like BSD spl() brain-damage. - * - * Furthermore, the IRQs on the MIPS board look basically (barring software - * IRQs which we don't use at all and all external interrupt sources are - * combined together on hardware interrupt 0 (MIPS IRQ 2)) like: - * - * MIPS IRQ Source - * -------- ------ - * 0 Software (ignored) - * 1 Software (ignored) - * 2 Combined hardware interrupt (hw0) - * 3 Hardware (ignored) - * 4 Hardware (ignored) - * 5 Hardware (ignored) - * 6 Hardware (ignored) - * 7 R4k timer (what we use) - * - * Note: On the SEAD board thing are a little bit different. - * Here IRQ 2 (hw0) is wired to the UART0 and IRQ 3 (hw1) is wired - * wired to UART1. - * - * We handle the IRQ according to _our_ priority which is: - * - * Highest ---- R4k Timer - * Lowest ---- Combined hardware interrupt - * - * then we just return, if multiple IRQs are pending then we will just take - * another exception, big deal. - */ - - .text - .set noreorder - .set noat - .align 5 - -NESTED(mipsIRQ, PT_SIZE, sp) - SAVE_ALL - CLI - .set at - - mfc0 s0, CP0_CAUSE - mfc0 s1, CP0_STATUS - and s0, s0, s1 - - /* First we check for r4k counter/timer IRQ. */ - andi a0, s0, CAUSEF_IP7 - beq a0, zero, 1f - nop - - move a0, sp - jal mips_timer_interrupt - nop - - j ret_from_irq - nop - -1: - andi a0, s0, CAUSEF_IP2 - beq a0, zero, 1f - nop - - move a0, sp - jal adm5120_hw0_irqdispatch - nop -1: - j ret_from_irq - nop - -END(mipsIRQ) - - -LEAF(mips_int_lock) - .set noreorder - mfc0 v0, CP0_STATUS - li v1, ~STATUS_IE - and v1, v1, v0 - mtc0 v1, CP0_STATUS - j ra - and v0, v0, STATUS_IE - .set reorder -END(mips_int_lock) - - -LEAF(mips_int_unlock) - mfc0 v0, CP0_STATUS - and a0, a0, STATUS_IE - or v0, v0, a0 - mtc0 v0, CP0_STATUS - j ra - nop -END(mips_int_unlock) - |