tools/virtio/linux/kernel.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef KERNEL_H
   3 #define KERNEL_H
   4 #include <stdbool.h>
   5 #include <stdlib.h>
   6 #include <stddef.h>
   7 #include <stdio.h>
   8 #include <string.h>
   9 #include <assert.h>
  10 #include <stdarg.h>
  11
  12 #include <linux/compiler.h>
  13 #include "../../../include/linux/container_of.h"
  14 #include <linux/log2.h>
  15 #include <linux/types.h>
  16 #include <linux/overflow.h>
  17 #include <linux/list.h>
  18 #include <linux/printk.h>
  19 #include <linux/bug.h>
  20 #include <errno.h>
  21 #include <unistd.h>
  22 #include <asm/barrier.h>
  23
  24 #define CONFIG_SMP
  25
  26 #define PAGE_SIZE getpagesize()
  27 #define PAGE_MASK (~(PAGE_SIZE-1))
  28 #define PAGE_ALIGN(x) ((x + PAGE_SIZE - 1) & PAGE_MASK)
  29
  30 /* generic data direction definitions */
  31 #define READ                    0
  32 #define WRITE                   1
  33
  34 typedef unsigned long long dma_addr_t;
  35 typedef size_t __kernel_size_t;
  36 typedef unsigned int __wsum;
  37
  38 struct page {
  39         unsigned long long dummy;
  40 };
  41
  42 /* Physical == Virtual */
  43 #define virt_to_phys(p) ((unsigned long)p)
  44 #define phys_to_virt(a) ((void *)(unsigned long)(a))
  45 /* Page address: Virtual / 4K */
  46 #define page_to_phys(p) ((dma_addr_t)(unsigned long)(p))
  47 #define virt_to_page(p) ((struct page *)((unsigned long)p & PAGE_MASK))
  48
  49 #define offset_in_page(p) (((unsigned long)p) % PAGE_SIZE)
  50
  51 #define __printf(a,b) __attribute__((format(printf,a,b)))
  52
  53 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  54
  55 extern void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
  56 static inline void *kmalloc(size_t s, gfp_t gfp)
  57 {
  58         if (__kmalloc_fake)
  59                 return __kmalloc_fake;
  60         return malloc(s);
  61 }
  62 static inline void *kmalloc_array(unsigned n, size_t s, gfp_t gfp)
  63 {
  64         return kmalloc(n * s, gfp);
  65 }
  66
  67 static inline void *kzalloc(size_t s, gfp_t gfp)
  68 {
  69         void *p = kmalloc(s, gfp);
  70
  71         memset(p, 0, s);
  72         return p;
  73 }
  74
  75 static inline void *alloc_pages_exact(size_t s, gfp_t gfp)
  76 {
  77         return kmalloc(s, gfp);
  78 }
  79
  80 static inline void kfree(void *p)
  81 {
  82         if (p >= __kfree_ignore_start && p < __kfree_ignore_end)
  83                 return;
  84         free(p);
  85 }
  86
  87 static inline void free_pages_exact(void *p, size_t s)
  88 {
  89         kfree(p);
  90 }
  91
  92 static inline void *krealloc(void *p, size_t s, gfp_t gfp)
  93 {
  94         return realloc(p, s);
  95 }
  96
  97
  98 static inline unsigned long __get_free_page(gfp_t gfp)
  99 {
 100         void *p;
 101
 102         posix_memalign(&p, PAGE_SIZE, PAGE_SIZE);
 103         return (unsigned long)p;
 104 }
 105
 106 static inline void free_page(unsigned long addr)
 107 {
 108         free((void *)addr);
 109 }
 110
 111 # ifndef likely
 112 #  define likely(x)     (__builtin_expect(!!(x), 1))
 113 # endif
 114 # ifndef unlikely
 115 #  define unlikely(x)   (__builtin_expect(!!(x), 0))
 116 # endif
 117
 118 static inline void *krealloc_array(void *p, size_t new_n, size_t new_size, gfp_t gfp)
 119 {
 120         size_t bytes;
 121
 122         if (unlikely(check_mul_overflow(new_n, new_size, &bytes)))
 123                 return NULL;
 124
 125         return krealloc(p, bytes, gfp);
 126 }
 127
 128 #define pr_err(format, ...) fprintf (stderr, format, ## __VA_ARGS__)
 129 #ifdef DEBUG
 130 #define pr_debug(format, ...) fprintf (stderr, format, ## __VA_ARGS__)
 131 #else
 132 #define pr_debug(format, ...) do {} while (0)
 133 #endif
 134 #define dev_err(dev, format, ...) fprintf (stderr, format, ## __VA_ARGS__)
 135 #define dev_warn(dev, format, ...) fprintf (stderr, format, ## __VA_ARGS__)
 136 #define dev_warn_once(dev, format, ...) fprintf (stderr, format, ## __VA_ARGS__)
 137
 138 #define min(x, y) ({                            \
 139         typeof(x) _min1 = (x);                  \
 140         typeof(y) _min2 = (y);                  \
 141         (void) (&_min1 == &_min2);              \
 142         _min1 < _min2 ? _min1 : _min2; })
 143
 144 #endif /* KERNEL_H */