arch/arm/include/debug/msm.S

Source file repositories/reference/linux-study-clean/arch/arm/include/debug/msm.S

File Facts

System
Linux kernel
Corpus path
arch/arm/include/debug/msm.S
Extension
.S
Size
1037 bytes
Lines
49
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

.macro	addruart, rp, rv, tmp
	ldr	\rp, =CONFIG_DEBUG_UART_PHYS
	ldr	\rv, =CONFIG_DEBUG_UART_VIRT
	.endm

	.macro	senduart, rd, rx
ARM_BE8(rev	\rd, \rd )
	@ Write the 1 character to UARTDM_TF
	str	\rd, [\rx, #0x70]
	.endm

	.macro	waituartcts,rd,rx
	.endm

	.macro	waituarttxrdy, rd, rx
	@ check for TX_EMT in UARTDM_SR
	ldr	\rd, [\rx, #0x08]
ARM_BE8(rev     \rd, \rd )
	tst	\rd, #0x08
	bne	1002f
	@ wait for TXREADY in UARTDM_ISR
1001:	ldr	\rd, [\rx, #0x14]
ARM_BE8(rev     \rd, \rd )
	tst	\rd, #0x80
	beq 	1001b
1002:
	@ Clear TX_READY by writing to the UARTDM_CR register
	mov	\rd, #0x300
ARM_BE8(rev     \rd, \rd )
	str	\rd, [\rx, #0x10]
	@ Write 0x1 to NCF register
	mov 	\rd, #0x1
ARM_BE8(rev     \rd, \rd )
	str	\rd, [\rx, #0x40]
	@ UARTDM reg. Read to induce delay
	ldr	\rd, [\rx, #0x08]
	.endm

	.macro	busyuart, rd, rx
	.endm

Annotation

Implementation Notes