diff options
Diffstat (limited to 'libgloss/sparc_leon/irqtrap.S')
| -rw-r--r-- | libgloss/sparc_leon/irqtrap.S | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/libgloss/sparc_leon/irqtrap.S b/libgloss/sparc_leon/irqtrap.S new file mode 100644 index 000000000..d13757731 --- /dev/null +++ b/libgloss/sparc_leon/irqtrap.S @@ -0,0 +1,108 @@ +/* + * Copyright (c) 2011 Aeroflex Gaisler + * + * BSD license: + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + + +#include <asm-leon/leonstack.h> +#include <asm-leon/asmmacro.h> +#include <asm-leon/winmacros.h> +#include <asm-leon/leon.h> + + /* l0: psr + l1: pc + l2: npc + l3: wim + l7: irqnr */ + + .seg "text" + + /* ------- */ + .weak _leonbare_irq_entry_svt + .set _leonbare_irq_entry_svt,__leonbare_irq_entry_svt + .weak leonbare_irq_entry + .set leonbare_irq_entry,_leonbare_irq_entry + /* ------- */ + !.global leonbare_irq_entry,_leonbare_irq_entry_svt + .global _irqtbl, _irqtrap, handler_irq, fpustate_current + +__leonbare_irq_entry_svt: /* irq from svt trap dispatcher */ + sub %l6,0x10, %l7 + rd %wim, %l3 + +_leonbare_irq_entry: + set SPARC_PSR_EF_MASK,%l6 + andn %l0, %l6, %l0 ! fpu off + + SAVE_ALL + + set nestcount,%o0 + ld [%o0],%o1 + add %o1,1,%o1 + st %o1,[%o0] + +#ifdef CONFIG_LEONBARE_NONESTEDIRQ + or %l0, SPARC_PSR_PIL_MASK, %o0 ! no nested irqs + wr %o0, SPARC_PSR_ET_MASK, %psr + WRITE_PAUSE +#else + sll %l7,SPARC_PSR_PIL_SHIFT,%o1 + andn %l0,SPARC_PSR_PIL_MASK,%o0 + or %l0, %o1, %o1 + set nestedirq,%o0 + ld [%o0],%o0 + cmp %g0,%o0 ! no nested irqs? + beq,a .L1 + or %o1, SPARC_PSR_PIL_MASK, %o1 +.L1: + wr %o1, SPARC_PSR_ET_MASK, %psr + WRITE_PAUSE +#endif + + mov %l7, %o0 ! irq level + call handler_irq ! void handler_irq (int irq, struct leonbare_pt_regs *pt_regs) +#ifndef _SOFT_FLOAT + add %sp, FW_REGS_SZ + 8 + SF_REGS_SZ , %o1 ! pt_regs ptr +#else + add %sp, SF_REGS_SZ , %o1 ! pt_regs ptr +#endif + + or %l0, SPARC_PSR_PIL_MASK, %o1 + wr %o1, SPARC_PSR_ET_MASK, %psr ! enable nesting again, keep ET up + WRITE_PAUSE + + set nestcount,%o0 + ld [%o0],%o1 + sub %o1,1,%o1 + st %o1,[%o0] + + RESTORE_ALL + + .seg "data" + .global nestedirq + .align 4 +nestedirq: + .long 0 + .global nestcount + .align 4 +nestcount: + .long 0 |