arch/arm/mach-omap2/omap-smc.S

Source file repositories/reference/linux-study-clean/arch/arm/mach-omap2/omap-smc.S

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-omap2/omap-smc.S
Extension
.S
Size
2449 bytes
Lines
97
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: arch/arm
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/linkage.h>

/*
 * This is common routine to manage secure monitor API
 * used to modify the PL310 secure registers.
 * 'r0' contains the value to be modified and 'r12' contains
 * the monitor API number. It uses few CPU registers
 * internally and hence they need be backed up including
 * link register "lr".
 * Function signature : void _omap_smc1(u32 fn, u32 arg)
 */
	.arch armv7-a
	.arch_extension sec
ENTRY(_omap_smc1)
	stmfd   sp!, {r2-r12, lr}
	mov	r12, r0
	mov 	r0, r1
	dsb
	smc	#0
	ldmfd   sp!, {r2-r12, pc}
ENDPROC(_omap_smc1)

/**
 * u32 omap_smc2(u32 id, u32 flag, u32 pargs)
 * Low level common routine for secure HAL and PPA APIs.
 * @id: Application ID of HAL APIs
 * @flag: Flag to indicate the criticality of operation
 * @pargs: Physical address of parameter list starting
 *	    with number of parametrs
 */
ENTRY(omap_smc2)
	stmfd   sp!, {r4-r12, lr}
	mov	r3, r2
	mov	r2, r1
	mov	r1, #0x0	@ Process ID
	mov	r6, #0xff
	mov	r12, #0x00	@ Secure Service ID
	mov	r7, #0
	mcr	p15, 0, r7, c7, c5, 6
	dsb
	dmb
	smc	#0
	ldmfd   sp!, {r4-r12, pc}
ENDPROC(omap_smc2)

/**
 * u32 omap_smc3(u32 service_id, u32 process_id, u32 flag, u32 pargs)
 * Low level common routine for secure HAL and PPA APIs via smc #1
 * r0 - @service_id: Secure Service ID
 * r1 - @process_id: Process ID
 * r2 - @flag: Flag to indicate the criticality of operation
 * r3 - @pargs: Physical address of parameter list
 */
ENTRY(omap_smc3)
	stmfd	sp!, {r4-r11, lr}
	mov	r12, r0		@ Copy the secure service ID
	mov	r6, #0xff	@ Indicate new Task call
	dsb			@ Memory Barrier (not sure if needed, copied from omap_smc2)
	smc	#1		@ Call PPA service
	ldmfd	sp!, {r4-r11, pc}
ENDPROC(omap_smc3)

ENTRY(omap_modify_auxcoreboot0)
	stmfd   sp!, {r1-r12, lr}
	ldr	r12, =0x104
	dsb
	smc	#0
	ldmfd   sp!, {r1-r12, pc}
ENDPROC(omap_modify_auxcoreboot0)

Annotation

Implementation Notes