arch/powerpc/kvm/book3s_32_sr.S

File Facts

System

Linux kernel

Corpus path

arch/powerpc/kvm/book3s_32_sr.S

Extension

.S

Size

3477 bytes

Lines

149

Domain

Architecture Layer

Bucket

arch/powerpc

Inferred role

Architecture Layer: arch/powerpc

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

• No C-style include directives detected by the generator.

Detected Declarations

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

Annotated Snippet

.macro LOAD_GUEST_SEGMENTS

	/* Required state:
	 *
	 * MSR = ~IR|DR
	 * R1 = host R1
	 * R2 = host R2
	 * R3 = shadow vcpu
	 * all other volatile GPRS = free except R4, R6
	 * SVCPU[CR]  = guest CR
	 * SVCPU[XER] = guest XER
	 * SVCPU[CTR] = guest CTR
	 * SVCPU[LR]  = guest LR
	 */

#define XCHG_SR(n)	lwz	r9, (SVCPU_SR+(n*4))(r3);  \
			mtsr	n, r9

	XCHG_SR(0)
	XCHG_SR(1)
	XCHG_SR(2)
	XCHG_SR(3)
	XCHG_SR(4)
	XCHG_SR(5)
	XCHG_SR(6)
	XCHG_SR(7)
	XCHG_SR(8)
	XCHG_SR(9)
	XCHG_SR(10)
	XCHG_SR(11)
	XCHG_SR(12)
	XCHG_SR(13)
	XCHG_SR(14)
	XCHG_SR(15)

	/* Clear BATs. */

#define KVM_KILL_BAT(n, reg)		\
        mtspr   SPRN_IBAT##n##U,reg;	\
        mtspr   SPRN_IBAT##n##L,reg;	\
        mtspr   SPRN_DBAT##n##U,reg;	\
        mtspr   SPRN_DBAT##n##L,reg;	\

        li	r9, 0
	KVM_KILL_BAT(0, r9)
	KVM_KILL_BAT(1, r9)
	KVM_KILL_BAT(2, r9)
	KVM_KILL_BAT(3, r9)

.endm

/******************************************************************************
 *                                                                            *
 *                               Exit code                                    *
 *                                                                            *
 *****************************************************************************/

.macro LOAD_HOST_SEGMENTS

	/* Register usage at this point:
	 *
	 * R1         = host R1
	 * R2         = host R2
	 * R12        = exit handler id
	 * R13        = shadow vcpu - SHADOW_VCPU_OFF
	 * SVCPU.*    = guest *
	 * SVCPU[CR]  = guest CR
	 * SVCPU[XER] = guest XER
	 * SVCPU[CTR] = guest CTR
	 * SVCPU[LR]  = guest LR

Annotation

• Atlas domain: Architecture Layer / arch/powerpc.
• 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.