arch/powerpc/kernel/cpu_setup_44x.S
Source file repositories/reference/linux-study-clean/arch/powerpc/kernel/cpu_setup_44x.S
File Facts
- System
- Linux kernel
- Corpus path
arch/powerpc/kernel/cpu_setup_44x.S- Extension
.S- Size
- 1459 bytes
- Lines
- 70
- 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
asm/processor.hasm/cputable.hasm/ppc_asm.h
Detected Declarations
- No top-level syscall, struct, function, initcall, or export declaration detected by the generator.
Annotated Snippet
#include <asm/processor.h>
#include <asm/cputable.h>
#include <asm/ppc_asm.h>
_GLOBAL(__setup_cpu_440ep)
b __init_fpu_44x
_GLOBAL(__setup_cpu_440epx)
mflr r4
bl __init_fpu_44x
bl __plb_disable_wrp
bl __fixup_440A_mcheck
mtlr r4
blr
_GLOBAL(__setup_cpu_440grx)
mflr r4
bl __plb_disable_wrp
bl __fixup_440A_mcheck
mtlr r4
blr
_GLOBAL(__setup_cpu_460ex)
_GLOBAL(__setup_cpu_460gt)
_GLOBAL(__setup_cpu_460sx)
_GLOBAL(__setup_cpu_apm821xx)
mflr r4
bl __init_fpu_44x
bl __fixup_440A_mcheck
mtlr r4
blr
_GLOBAL(__setup_cpu_440x5)
_GLOBAL(__setup_cpu_440gx)
_GLOBAL(__setup_cpu_440spe)
b __fixup_440A_mcheck
/* enable APU between CPU and FPU */
_GLOBAL(__init_fpu_44x)
mfspr r3,SPRN_CCR0
/* Clear DAPUIB flag in CCR0 */
rlwinm r3,r3,0,12,10
mtspr SPRN_CCR0,r3
isync
blr
/*
* Workaround for the incorrect write to DDR SDRAM errata.
* The write address can be corrupted during writes to
* DDR SDRAM when write pipelining is enabled on PLB0.
* Disable write pipelining here.
*/
#define DCRN_PLB4A0_ACR 0x81
_GLOBAL(__plb_disable_wrp)
mfdcr r3,DCRN_PLB4A0_ACR
/* clear WRP bit in PLB4A0_ACR */
rlwinm r3,r3,0,8,6
mtdcr DCRN_PLB4A0_ACR,r3
isync
blr
Annotation
- Immediate include surface: `asm/processor.h`, `asm/cputable.h`, `asm/ppc_asm.h`.
- 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.