arch/arm/include/debug/dc21285.S

File Facts

System

Linux kernel

Corpus path

arch/arm/include/debug/dc21285.S

Extension

.S

Size

842 bytes

Lines

42

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.

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

Dependency Surface

• asm/hardware/dec21285.h
• mach/hardware.h

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

#include <asm/hardware/dec21285.h>

#include <mach/hardware.h>
	/* For EBSA285 debugging */
		.equ	dc21285_high, ARMCSR_BASE & 0xff000000
		.equ	dc21285_low,  ARMCSR_BASE & 0x00ffffff

		.macro	addruart, rp, rv, tmp
		.if	dc21285_low
		mov	\rp, #dc21285_low
		.else
		mov	\rp, #0
		.endif
		orr	\rv, \rp, #dc21285_high
		orr	\rp, \rp, #0x42000000
		.endm

		.macro	senduart,rd,rx
		str	\rd, [\rx, #0x160]	@ UARTDR
		.endm

		.macro	busyuart,rd,rx
1001:		ldr	\rd, [\rx, #0x178]	@ UARTFLG
		tst	\rd, #1 << 3
		bne	1001b
		.endm

		.macro	waituartcts,rd,rx
		.endm

		.macro	waituarttxrdy,rd,rx
		.endm

Annotation

• Immediate include surface: `asm/hardware/dec21285.h`, `mach/hardware.h`.
• Atlas domain: Architecture Layer / arch/arm.
• Implementation status: atlas-only.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.