arch/powerpc/kernel/pci_32.c

Source file repositories/reference/linux-study-clean/arch/powerpc/kernel/pci_32.c

File Facts

System: Linux kernel
Corpus path: arch/powerpc/kernel/pci_32.c
Extension: .c
Size: 8701 bytes
Lines: 348
Domain: Architecture Layer
Bucket: arch/powerpc
Inferred role: Architecture Layer: syscall or user/kernel boundary
Status: core implementation candidate

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.
Defines or participates in a user/kernel boundary; inspect argument validation, copy_from_user/copy_to_user, credentials, and dispatch target.
Allocates kernel memory; connect allocation flags and lifetime to context constraints.
Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

linux/kernel.h
linux/pci.h
linux/delay.h
linux/string.h
linux/init.h
linux/capability.h
linux/sched.h
linux/errno.h
linux/memblock.h
linux/syscalls.h
linux/irq.h
linux/list.h
linux/of.h
linux/slab.h
linux/export.h
asm/processor.h
asm/io.h
asm/sections.h
asm/pci-bridge.h
asm/ppc-pci.h
asm/byteorder.h
linux/uaccess.h
asm/machdep.h

Detected Declarations

syscall pciconfig_iobase
function fixup_cpc710_pci64
function make_one_node_map
function for_each_child_of_node
function pcibios_make_OF_bus_map
function pci_device_from_OF_node
function for_each_pci_dev
function pci_create_OF_bus_map
function pcibios_setup_phb_io_space
function pcibios_init
function pci_bus_to_hose
module init pcibios_init
export isa_io_base
export pci_dram_offset
export isa_bridge_pcidev
export pci_device_from_OF_node

Annotated Snippet

SYSCALL_DEFINE3(pciconfig_iobase, long, which,
		unsigned long, bus, unsigned long, devfn)
{
	struct pci_controller* hose;
	long result = -EOPNOTSUPP;

	hose = pci_bus_to_hose(bus);
	if (!hose)
		return -ENODEV;

	switch (which) {
	case IOBASE_BRIDGE_NUMBER:
		return (long)hose->first_busno;
	case IOBASE_MEMORY:
		return (long)hose->mem_offset[0];
	case IOBASE_IO:
		return (long)hose->io_base_phys;
	case IOBASE_ISA_IO:
		return (long)isa_io_base;
	case IOBASE_ISA_MEM:
		return (long)isa_mem_base;
	}

	return result;
}

Annotation

Immediate include surface: `linux/kernel.h`, `linux/pci.h`, `linux/delay.h`, `linux/string.h`, `linux/init.h`, `linux/capability.h`, `linux/sched.h`, `linux/errno.h`.
Detected declarations: `syscall pciconfig_iobase`, `function fixup_cpc710_pci64`, `function make_one_node_map`, `function for_each_child_of_node`, `function pcibios_make_OF_bus_map`, `function pci_device_from_OF_node`, `function for_each_pci_dev`, `function pci_create_OF_bus_map`, `function pcibios_setup_phb_io_space`, `function pcibios_init`.
Atlas domain: Architecture Layer / arch/powerpc.
Implementation status: core implementation candidate.

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.