android_kernel_motorola_sm6225/include/asm-arm/arch-integrator/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

44 lines
1.1 KiB
ArmAsm

/*
* include/asm-arm/arch-integrator/entry-macro.S
*
* Low-level IRQ helper macros for Integrator platforms
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <asm/hardware.h>
#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
/* FIXME: should not be using soo many LDRs here */
ldr \base, =IO_ADDRESS(INTEGRATOR_IC_BASE)
mov \irqnr, #IRQ_PIC_START
ldr \irqstat, [\base, #IRQ_STATUS] @ get masked status
ldr \base, =IO_ADDRESS(INTEGRATOR_HDR_BASE)
teq \irqstat, #0
ldreq \irqstat, [\base, #(INTEGRATOR_HDR_IC_OFFSET+IRQ_STATUS)]
moveq \irqnr, #IRQ_CIC_START
1001: tst \irqstat, #15
bne 1002f
add \irqnr, \irqnr, #4
movs \irqstat, \irqstat, lsr #4
bne 1001b
1002: tst \irqstat, #1
bne 1003f
add \irqnr, \irqnr, #1
movs \irqstat, \irqstat, lsr #1
bne 1002b
1003: /* EQ will be set if no irqs pending */
.endm