arch/arm/mach-rpc/riscpc.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-rpc/riscpc.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-rpc/riscpc.c
Extension
.c
Size
4745 bytes
Lines
226
Domain
Architecture Layer
Bucket
arch/arm
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

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/arch/arm/mach-rpc/riscpc.c
 *
 *  Copyright (C) 1998-2001 Russell King
 *
 *  Architecture specific fixups.
 */
#include <linux/kernel.h>
#include <linux/tty.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/device.h>
#include <linux/serial_8250.h>
#include <linux/ata_platform.h>
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/reboot.h>

#include <asm/elf.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <asm/hardware/iomd.h>
#include <asm/page.h>
#include <asm/domain.h>
#include <asm/setup.h>
#include <asm/system_misc.h>

#include <asm/mach/map.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>

extern void rpc_init_irq(void);

unsigned int vram_size;
unsigned int memc_ctrl_reg;
unsigned int number_mfm_drives;

static int __init parse_tag_acorn(const struct tag *tag)
{
	memc_ctrl_reg = tag->u.acorn.memc_control_reg;
	number_mfm_drives = tag->u.acorn.adfsdrives;

	switch (tag->u.acorn.vram_pages) {
	case 512:
		vram_size += PAGE_SIZE * 256;
		fallthrough;	/* ??? */
	case 256:
		vram_size += PAGE_SIZE * 256;
		break;
	default:
		break;
	}
#if 0
	if (vram_size) {
		desc->video_start = 0x02000000;
		desc->video_end   = 0x02000000 + vram_size;
	}
#endif
	return 0;
}

__tagtable(ATAG_ACORN, parse_tag_acorn);

static struct map_desc rpc_io_desc[] __initdata = {
 	{	/* VRAM		*/
		.virtual	=  SCREEN_BASE,
		.pfn		= __phys_to_pfn(SCREEN_START),
		.length		= 	2*1048576,
		.type		= MT_DEVICE
	}, {	/* IO space	*/
		.virtual	=  (u32)IO_BASE,
		.pfn		= __phys_to_pfn(IO_START),
		.length		= 	IO_SIZE	 ,
		.type		= MT_DEVICE
	}, {	/* EASI space	*/
		.virtual	= (unsigned long)EASI_BASE,
		.pfn		= __phys_to_pfn(EASI_START),
		.length		= EASI_SIZE,
		.type		= MT_DEVICE
	}
};

static void __init rpc_map_io(void)
{
	iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc));

	/*

Annotation

Implementation Notes