函数源码

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source File:kernel\resource.c Create Date:2022-07-27 10:05:27
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#undef reserved
/*
 * Reserve I/O ports or memory based on "reserve=" kernel parameter.
 */
#define MAXRESERVE 4
static int __init reserve_setup(char *str)
{
    static int reserved;
    static struct resource reserve[MAXRESERVE];
 
    for (;;) {
        unsigned int io_start, io_num;
        int x = reserved;
        struct resource *parent;
 
        if (get_option(&str, &io_start) != 2)
            break;
        if (get_option(&str, &io_num) == 0)
            break;
        if (x < MAXRESERVE) {
            struct resource *res = reserve + x;
 
            /*
             * If the region starts below 0x10000, we assume it's
             * I/O port space; otherwise assume it's memory.
             */
            if (io_start < 0x10000) {
                res->flags = IORESOURCE_IO;
                parent = &ioport_resource;
            } else {
                res->flags = IORESOURCE_MEM;
                parent = &iomem_resource;
            }
            res->name = "reserved";
            res->start = io_start;
            res->end = io_start + io_num - 1;
            res->flags |= IORESOURCE_BUSY;
            res->desc = IORES_DESC_NONE;
            res->child = NULL;
            if (request_resource(parent, res) == 0)
                reserved = x+1;
        }
    }
    return 1;
}