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Annotation of Gnu-Mach/linux/dev/kernel/resource.c, revision 1.1

1.1     ! root        1: /*
        !             2:  *     linux/kernel/resource.c
        !             3:  *
        !             4:  * Copyright (C) 1995  Linus Torvalds
        !             5:  *                     David Hinds
        !             6:  *
        !             7:  * Kernel io-region resource management
        !             8:  */
        !             9: 
        !            10: #include <sys/types.h>
        !            11: 
        !            12: #define MACH_INCLUDE
        !            13: #include <linux/sched.h>
        !            14: #include <linux/kernel.h>
        !            15: #include <linux/errno.h>
        !            16: #include <linux/types.h>
        !            17: #include <linux/ioport.h>
        !            18: 
        !            19: #define IOTABLE_SIZE 128
        !            20: 
        !            21: typedef struct resource_entry_t
        !            22: {
        !            23:   u_long from, num;
        !            24:   const char *name;
        !            25:   struct resource_entry_t *next;
        !            26: } resource_entry_t;
        !            27: 
        !            28: static resource_entry_t iolist = { 0, 0, "", NULL };
        !            29: 
        !            30: static resource_entry_t iotable[IOTABLE_SIZE];
        !            31: 
        !            32: /*
        !            33:  * This generates the report for /proc/ioports
        !            34:  */
        !            35: #ifndef MACH
        !            36: int
        !            37: get_ioport_list (char *buf)
        !            38: {
        !            39:   resource_entry_t *p;
        !            40:   int len = 0;
        !            41:   
        !            42:   for (p = iolist.next; (p) && (len < 4000); p = p->next)
        !            43:     len += linux_sprintf (buf+len, "%04lx-%04lx : %s\n",
        !            44:                          p->from, p->from+p->num-1, p->name);
        !            45:   if (p)
        !            46:     len += linux_sprintf (buf+len, "4K limit reached!\n");
        !            47:   return len;
        !            48: }
        !            49: #endif
        !            50: 
        !            51: /*
        !            52:  * The workhorse function: find where to put a new entry
        !            53:  */
        !            54: static resource_entry_t *
        !            55: find_gap (resource_entry_t *root, u_long from, u_long num)
        !            56: {
        !            57:   unsigned long flags;
        !            58:   resource_entry_t *p;
        !            59:   
        !            60:   if (from > from+num-1)
        !            61:     return NULL;
        !            62:   save_flags (flags);
        !            63:   cli ();
        !            64:   for (p = root; ; p = p->next)
        !            65:     {
        !            66:       if ((p != root) && (p->from+p->num-1 >= from))
        !            67:        {
        !            68:          p = NULL;
        !            69:          break;
        !            70:        }
        !            71:       if ((p->next == NULL) || (p->next->from > from+num-1))
        !            72:        break;
        !            73:     }
        !            74:   restore_flags (flags);
        !            75:   return p;
        !            76: }
        !            77: 
        !            78: /*
        !            79:  * Call this from the device driver to register the ioport region.
        !            80:  */
        !            81: void
        !            82: request_region (unsigned int from, unsigned int num, const char *name)
        !            83: {
        !            84:   resource_entry_t *p;
        !            85:   int i;
        !            86:   
        !            87:   for (i = 0; i < IOTABLE_SIZE; i++)
        !            88:     if (iotable[i].num == 0)
        !            89:       break;
        !            90:   if (i == IOTABLE_SIZE)
        !            91:     printk ("warning: ioport table is full\n");
        !            92:   else
        !            93:     {
        !            94:       p = find_gap (&iolist, from, num);
        !            95:       if (p == NULL)
        !            96:        return;
        !            97:       iotable[i].name = name;
        !            98:       iotable[i].from = from;
        !            99:       iotable[i].num = num;
        !           100:       iotable[i].next = p->next;
        !           101:       p->next = &iotable[i];
        !           102:       return;
        !           103:     }
        !           104: }
        !           105: 
        !           106: /* 
        !           107:  * Call this when the device driver is unloaded
        !           108:  */
        !           109: void
        !           110: release_region (unsigned int from, unsigned int num)
        !           111: {
        !           112:   resource_entry_t *p, *q;
        !           113:   
        !           114:   for (p = &iolist; ; p = q)
        !           115:     {
        !           116:       q = p->next;
        !           117:       if (q == NULL)
        !           118:        break;
        !           119:       if ((q->from == from) && (q->num == num))
        !           120:        {
        !           121:          q->num = 0;
        !           122:          p->next = q->next;
        !           123:          return;
        !           124:        }
        !           125:     }
        !           126: }
        !           127: 
        !           128: /*
        !           129:  * Call this to check the ioport region before probing
        !           130:  */
        !           131: int
        !           132: check_region (unsigned int from, unsigned int num)
        !           133: {
        !           134:   return (find_gap (&iolist, from, num) == NULL) ? -LINUX_EBUSY : 0;
        !           135: }
        !           136: 
        !           137: /* Called from init/main.c to reserve IO ports. */
        !           138: void
        !           139: reserve_setup(char *str, int *ints)
        !           140: {
        !           141:   int i;
        !           142:   
        !           143:   for (i = 1; i < ints[0]; i += 2)
        !           144:     request_region (ints[i], ints[i+1], "reserved");
        !           145: }

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