cregit-Linux how code gets into the kernel

Release 4.13 arch/arm/mach-gemini/board-dt.c

/*
 * Gemini Device Tree boot support
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/system_misc.h>
#include <asm/proc-fns.h>

#ifdef CONFIG_DEBUG_GEMINI
/* This is needed for LL-debug/earlyprintk/debug-macro.S */

static struct map_desc gemini_io_desc[] __initdata = {
	{
		.virtual = CONFIG_DEBUG_UART_VIRT,
		.pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS),
		.length = SZ_4K,
		.type = MT_DEVICE,
        },
};


static void __init gemini_map_io(void) { iotable_init(gemini_io_desc, ARRAY_SIZE(gemini_io_desc)); }

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#else #define gemini_map_io NULL #endif
static void gemini_idle(void) { /* * Because of broken hardware we have to enable interrupts or the CPU * will never wakeup... Acctualy it is not very good to enable * interrupts first since scheduler can miss a tick, but there is * no other way around this. Platforms that needs it for power saving * should enable it in init code, since by default it is * disabled. */ /* FIXME: Enabling interrupts here is racy! */ local_irq_enable(); cpu_do_idle(); }

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static void __init gemini_init_machine(void) { arm_pm_idle = gemini_idle; }

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static const char *gemini_board_compat[] = { "cortina,gemini", NULL, }; DT_MACHINE_START(GEMINI_DT, "Gemini (Device Tree)") .map_io = gemini_map_io, .init_machine = gemini_init_machine, .dt_compat = gemini_board_compat, MACHINE_END

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