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