linux-hardened/include/asm-arm/arch-aaec2000/entry-macro.S
Dan Williams f80dff9da0 [ARM] 4185/2: entry: introduce get_irqnr_preamble and arch_ret_to_user
get_irqnr_preamble allows machines to take some action before entering the
get_irqnr_and_base loop.  On iop we enable cp6 access.

arch_ret_to_user is added to the userspace return path to allow individual
architectures to take actions, like disabling coprocessor access, before
the final return to userspace.

Per Nicolas Pitre's note, there is no need to cp_wait on the return to user
as the latency to return is sufficient.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-02-17 15:04:29 +00:00

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ArmAsm

/*
* linux/include/asm-arm/arch-aaec2000/entry-macro.S
*
* Low-level IRQ helper for aaec-2000 based platforms
*
* Copyright (c) 2005 Nicolas Bellido Y Ortega
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <asm/arch/irqs.h>
.macro disable_fiq
.endm
.macro get_irqnr_preamble, base, tmp
.endm
.macro arch_ret_to_user, tmp1, tmp2
.endm
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
mov r4, #0xf8000000
add r4, r4, #0x00000500
mov \base, r4
ldr \irqstat, [\base, #0]
cmp \irqstat, #0
bne 1001f
ldr \irqnr, =NR_IRQS+1
b 1003f
1001: mov \irqnr, #0
1002: ands \tmp, \irqstat, #1
mov \irqstat, \irqstat, LSR #1
add \irqnr, \irqnr, #1
beq 1002b
sub \irqnr, \irqnr, #1
1003:
.endm