arch/arm/include/debug/vexpress.S

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

File Facts

System
Linux kernel
Corpus path
arch/arm/include/debug/vexpress.S
Extension
.S
Size
1216 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

#define DEBUG_LL_PHYS_BASE		0x10000000
#define DEBUG_LL_UART_OFFSET		0x00009000

#define DEBUG_LL_PHYS_BASE_RS1		0x1c000000
#define DEBUG_LL_UART_OFFSET_RS1	0x00090000

#define DEBUG_LL_UART_PHYS_CRX		0xb0090000

#define DEBUG_LL_VIRT_BASE		0xf8000000

#if defined(CONFIG_DEBUG_VEXPRESS_UART0_DETECT)

		.macro	addruart,rp,rv,tmp
		.arch   armv7-a

		@ Make an educated guess regarding the memory map:
		@ - the original A9 core tile (based on ARM Cortex-A9 r0p1)
		@   should use UART at 0x10009000
		@ - all other (RS1 complaint) tiles use UART mapped
		@   at 0x1c090000
		mrc	p15, 0, \rp, c0, c0, 0
		movw	\rv, #0xc091
		movt	\rv, #0x410f
		cmp	\rp, \rv

		@ Original memory map
		moveq	\rp, #DEBUG_LL_UART_OFFSET
		orreq	\rv, \rp, #DEBUG_LL_VIRT_BASE
		orreq	\rp, \rp, #DEBUG_LL_PHYS_BASE

		@ RS1 memory map
		movne	\rp, #DEBUG_LL_UART_OFFSET_RS1
		orrne	\rv, \rp, #DEBUG_LL_VIRT_BASE
		orrne	\rp, \rp, #DEBUG_LL_PHYS_BASE_RS1

		.endm

#include <debug/pl01x.S>
#endif

Annotation

Implementation Notes