arch/powerpc/boot/treeboot-currituck.c

Source file repositories/reference/linux-study-clean/arch/powerpc/boot/treeboot-currituck.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/boot/treeboot-currituck.c
Extension
.c
Size
2855 bytes
Lines
116
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source 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.

Dependency Surface

Detected Declarations

Annotated Snippet

if (getprop(devp, "dma-ranges", dma_ranges, sizeof(dma_ranges)) < 0) {
			printf("%s: Failed to get dma-ranges\r\n", __func__);
			continue;
		}

		dma_ranges[5] = ibm_currituck_memsize >> 32;
		dma_ranges[6] = ibm_currituck_memsize & 0xffffffffUL;

		setprop(devp, "dma-ranges", dma_ranges, sizeof(dma_ranges));
	}
}

#define SPRN_PIR	0x11E	/* Processor Identification Register */
void platform_init(void)
{
	unsigned long end_of_ram, avail_ram;
	u32 pir_reg;
	int node, size;
	const u32 *timebase;

	ibm_currituck_memsize = ibm_currituck_detect_memsize();
	if (ibm_currituck_memsize >> 32)
		end_of_ram = ~0UL;
	else
		end_of_ram = ibm_currituck_memsize;
	avail_ram = end_of_ram - (unsigned long)_end;

	simple_alloc_init(_end, avail_ram, 128, 64);
	platform_ops.fixups = ibm_currituck_fixups;
	platform_ops.exit = ibm44x_dbcr_reset;
	pir_reg = mfspr(SPRN_PIR);

	/* Make sure FDT blob is sane */
	if (fdt_check_header(_dtb_start) != 0)
		fatal("Invalid device tree blob\n");

	node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
	                                     "cpu", sizeof("cpu"));
	if (!node)
		fatal("Cannot find cpu node\n");
	timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
	if (timebase && (size == 4))
		timebase_period_ns = 1000000000 / *timebase;

	fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
	fdt_init(_dtb_start);

	serial_console_init();
}

Annotation

Implementation Notes