arch/arm/include/debug/renesas-scif.S

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

File Facts

System
Linux kernel
Corpus path
arch/arm/include/debug/renesas-scif.S
Extension
.S
Size
1074 bytes
Lines
57
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

#define SCIF_PHYS	CONFIG_DEBUG_UART_PHYS
#define SCIF_VIRT	((SCIF_PHYS & 0x00ffffff) | 0xfd000000)

#if defined(CONFIG_DEBUG_R7S9210_SCIF2) || defined(CONFIG_DEBUG_R7S9210_SCIF4)
/* RZ/A2 SCIFA */
#define FTDR		0x06
#define FSR		0x08
#elif CONFIG_DEBUG_UART_PHYS < 0xe6e00000
/* SCIFA */
#define FTDR		0x20
#define FSR		0x14
#else
/* SCIF */
#define FTDR		0x0c
#define FSR		0x10
#endif

#define TDFE	(1 << 5)
#define TEND	(1 << 6)

	.macro	addruart, rp, rv, tmp
	ldr	\rp, =SCIF_PHYS
	ldr	\rv, =SCIF_VIRT
	.endm

	.macro	waituartcts,rd,rx
	.endm

	.macro	waituarttxrdy, rd, rx
1001:	ldrh	\rd, [\rx, #FSR]
	tst	\rd, #TDFE
	beq	1001b
	.endm

	.macro	senduart, rd, rx
	strb	\rd, [\rx, #FTDR]
	ldrh	\rd, [\rx, #FSR]
	bic	\rd, \rd, #TEND
	strh	\rd, [\rx, #FSR]
	.endm

	.macro	busyuart, rd, rx
1001:	ldrh	\rd, [\rx, #FSR]
	tst	\rd, #TEND
	beq	1001b
	.endm

Annotation

Implementation Notes