arch/mips/sgi-ip27/ip27-console.c

Source file repositories/reference/linux-study-clean/arch/mips/sgi-ip27/ip27-console.c

File Facts

System
Linux kernel
Corpus path
arch/mips/sgi-ip27/ip27-console.c
Extension
.c
Size
933 bytes
Lines
43
Domain
Architecture Layer
Bucket
arch/mips
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

#include <asm/page.h>
#include <asm/setup.h>
#include <asm/sn/addrs.h>
#include <asm/sn/agent.h>
#include <asm/sn/klconfig.h>
#include <asm/sn/ioc3.h>

#include <linux/serial.h>
#include <linux/serial_core.h>

#include "ip27-common.h"

#define IOC3_CLK	(22000000 / 3)
#define IOC3_FLAGS	(0)

static inline struct ioc3_uartregs *console_uart(void)
{
	struct ioc3 *ioc3;
	nasid_t nasid;

	nasid = (master_nasid == INVALID_NASID) ? get_nasid() : master_nasid;
	ioc3 = (struct ioc3 *)KL_CONFIG_CH_CONS_INFO(nasid)->memory_base;

	return &ioc3->sregs.uarta;
}

void prom_putchar(char c)
{
	struct ioc3_uartregs *uart = console_uart();

	while ((readb(&uart->iu_lsr) & 0x20) == 0)
		;
	writeb(c, &uart->iu_thr);
}

Annotation

Implementation Notes