diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2020-02-26 03:35:36 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-04-01 13:42:13 +1100 |
| commit | 3282a3da25bd63fdb7240bc35dbdefa4b1947005 (patch) | |
| tree | dd8f9c2c31869a30d2340d623ecb167174322eff /arch/powerpc/kernel/exceptions-64e.S | |
| parent | 993c670a4dfb2bded39d96f11df763c657d15a41 (diff) | |
powerpc/64: Implement soft interrupt replay in C
When local_irq_enable() finds a pending soft-masked interrupt, it
"replays" it by setting up registers like the initial interrupt entry,
then calls into the low level handler to set up an interrupt stack
frame and process the interrupt.
This is not necessary, and uses more stack than needed. The high level
interrupt handler can be called directly from C, with just pt_regs set
up on stack. This should be faster and use less stack.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200225173541.1549955-28-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64e.S')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64e.S | 32 |
1 files changed, 0 insertions, 32 deletions
diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S index e4076e3c072d..4efac5490216 100644 --- a/arch/powerpc/kernel/exceptions-64e.S +++ b/arch/powerpc/kernel/exceptions-64e.S @@ -1003,38 +1003,6 @@ masked_interrupt_book3e_0x2c0: masked_interrupt_book3e PACA_IRQ_DBELL 0 /* - * Called from arch_local_irq_enable when an interrupt needs - * to be resent. r3 contains either 0x500,0x900,0x260 or 0x280 - * to indicate the kind of interrupt. MSR:EE is already off. - * We generate a stackframe like if a real interrupt had happened. - * - * Note: While MSR:EE is off, we need to make sure that _MSR - * in the generated frame has EE set to 1 or the exception - * handler will not properly re-enable them. - */ -_GLOBAL(__replay_interrupt) - /* We are going to jump to the exception common code which - * will retrieve various register values from the PACA which - * we don't give a damn about. - */ - mflr r10 - mfmsr r11 - mfcr r4 - mtspr SPRN_SPRG_GEN_SCRATCH,r13; - std r1,PACA_EXGEN+EX_R1(r13); - stw r4,PACA_EXGEN+EX_CR(r13); - ori r11,r11,MSR_EE - subi r1,r1,INT_FRAME_SIZE; - cmpwi cr0,r3,0x500 - beq exc_0x500_common - cmpwi cr0,r3,0x900 - beq exc_0x900_common - cmpwi cr0,r3,0x280 - beq exc_0x280_common - blr - - -/* * This is called from 0x300 and 0x400 handlers after the prologs with * r14 and r15 containing the fault address and error code, with the * original values stashed away in the PACA |