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/limits.h>
 18#include <linux/list.h>
 19#include <linux/printk.h>
 20#include <linux/bug.h>
 21#include <errno.h>
 22#include <unistd.h>
 23#include <asm/barrier.h>
 24
 25#define CONFIG_SMP
 26
 27#define PAGE_SIZE getpagesize()
 28#define PAGE_MASK (~(PAGE_SIZE-1))
 29#define PAGE_ALIGN(x) ((x + PAGE_SIZE - 1) & PAGE_MASK)
 30
 31/* generic data direction definitions */
 32#define READ                    0
 33#define WRITE                   1
 34
 35typedef unsigned long long dma_addr_t;
 36typedef size_t __kernel_size_t;
 37typedef unsigned int __wsum;
 38
 39struct page {
 40	unsigned long long dummy;
 41};
 42
 43/* Physical == Virtual */
 44#define virt_to_phys(p) ((unsigned long)p)
 45#define phys_to_virt(a) ((void *)(unsigned long)(a))
 46/* Page address: Virtual / 4K */
 47#define page_to_phys(p) ((dma_addr_t)(unsigned long)(p))
 48#define virt_to_page(p) ((struct page *)((unsigned long)p & PAGE_MASK))
 49
 50#define offset_in_page(p) (((unsigned long)p) % PAGE_SIZE)
 51
 52#define __printf(a,b) __attribute__((format(printf,a,b)))
 53
 54#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
 55
 56extern void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
 57static inline void *kmalloc(size_t s, gfp_t gfp)
 58{
 59	if (__kmalloc_fake)
 60		return __kmalloc_fake;
 61	return malloc(s);
 62}
 63static inline void *kmalloc_array(unsigned n, size_t s, gfp_t gfp)
 64{
 65	return kmalloc(n * s, gfp);
 66}
 67
 68static inline void *kzalloc(size_t s, gfp_t gfp)
 69{
 70	void *p = kmalloc(s, gfp);
 71
 72	memset(p, 0, s);
 73	return p;
 74}
 75
 76static inline void *alloc_pages_exact(size_t s, gfp_t gfp)
 77{
 78	return kmalloc(s, gfp);
 79}
 80
 81static inline void kfree(void *p)
 82{
 83	if (p >= __kfree_ignore_start && p < __kfree_ignore_end)
 84		return;
 85	free(p);
 86}
 87
 88static inline void free_pages_exact(void *p, size_t s)
 89{
 90	kfree(p);
 91}
 92
 93static inline void *krealloc(void *p, size_t s, gfp_t gfp)
 94{
 95	return realloc(p, s);
 96}
 97
 98
 99static inline unsigned long __get_free_page(gfp_t gfp)
100{
101	void *p;
102
103	posix_memalign(&p, PAGE_SIZE, PAGE_SIZE);
104	return (unsigned long)p;
105}
106
107static inline void free_page(unsigned long addr)
108{
109	free((void *)addr);
110}
111
112# ifndef likely
113#  define likely(x)	(__builtin_expect(!!(x), 1))
114# endif
115# ifndef unlikely
116#  define unlikely(x)	(__builtin_expect(!!(x), 0))
117# endif
118
119static inline void *krealloc_array(void *p, size_t new_n, size_t new_size, gfp_t gfp)
120{
121	size_t bytes;
122
123	if (unlikely(check_mul_overflow(new_n, new_size, &bytes)))
124		return NULL;
125
126	return krealloc(p, bytes, gfp);
127}
128
129#define pr_err(format, ...) fprintf (stderr, format, ## __VA_ARGS__)
130#ifdef DEBUG
131#define pr_debug(format, ...) fprintf (stderr, format, ## __VA_ARGS__)
132#else
133#define pr_debug(format, ...) do {} while (0)
134#endif
135#define dev_err(dev, format, ...) fprintf (stderr, format, ## __VA_ARGS__)
136#define dev_warn(dev, format, ...) fprintf (stderr, format, ## __VA_ARGS__)
137#define dev_warn_once(dev, format, ...) fprintf (stderr, format, ## __VA_ARGS__)
138
139#define dev_WARN_ONCE(dev, condition, format...) \
140	WARN_ONCE(condition, format)
141
142static inline bool is_vmalloc_addr(const void *x)
143{
144	return false;
145}
146
147#define might_sleep() do { } while (0)
148
149static inline void synchronize_rcu(void)
150{
151	assert(0);
152}
153
154#define min(x, y) ({				\
155	typeof(x) _min1 = (x);			\
156	typeof(y) _min2 = (y);			\
157	(void) (&_min1 == &_min2);		\
158	_min1 < _min2 ? _min1 : _min2; })
159
160#endif /* KERNEL_H */