diff options
Diffstat (limited to '')
| -rw-r--r-- | kernel/old/include/x86/ops.h | 443 |
1 files changed, 0 insertions, 443 deletions
diff --git a/kernel/old/include/x86/ops.h b/kernel/old/include/x86/ops.h deleted file mode 100644 index ad795b9..0000000 --- a/kernel/old/include/x86/ops.h +++ /dev/null @@ -1,443 +0,0 @@ -/** -** @file ops.h -** -** @author Warren R. Carithers -** -** @brief Inline escapes to assembly for efficiency -** -** Inspiration from: -** Martins Mozeiko, https://gist.github.com/mmozeiko/f68ad2546bd6ab953315 -** MIT's xv6, https://github.com/mit-pdos/xv6-public -** -** Note: normally, GCC doesn't inline unless the optimization level is -** over 1. This can be forced by adding -** -** __attribute__((always_inline)) -** -** after the parameter list on each declaration. This is enabled by -** defining the compile-time CPP symbol FORCE_INLINING. -*/ - -#ifndef OPS_H_ -#define OPS_H_ - -#include <common.h> - -#ifndef ASM_SRC - -// control "forced" inlining -#ifdef FORCE_INLINING -#define OPSINLINED __attribute__((always_inline)) -#else -#define OPSINLINED /* no-op */ -#endif /* FORCE_INLINING */ - -/**************************** -** Data movement -****************************/ - -/** -** Block move functions -** -** Variations: movsb(), movsl(), movsq() -** -** Description: Copy from source buffer to destination buffer -** -** @param dst Destination buffer -** @param src Source buffer -** @param len Byte count -*/ -static inline void -movsb( void* dst, const void* src, uint32_t len ) OPSINLINED -{ - __asm__ __volatile__( "cld; rep movsb" - : "+D"(dst), "+S"(src), "+c"(len) - : : "memory" ); -} - -static inline void -movsw( void* dst, const void* src, uint32_t len ) OPSINLINED -{ - __asm__ __volatile__( "cld; rep movsw" - : "+D"(dst), "+S"(src), "+c"(len) - : : "memory" ); -} - -static inline void -movsl( void* dst, const void* src, uint32_t len ) OPSINLINED -{ - __asm__ __volatile__( "cld; rep movsl" - : "+D"(dst), "+S"(src), "+c"(len) - : : "memory" ); -} - -static inline void -movsq( void* dst, const void* src, uint32_t len ) OPSINLINED -{ - __asm__ __volatile__( "cld; rep movsq" - : "+D"(dst), "+S"(src), "+c"(len) - : : "memory" ); -} - -/** -** Block store functions -** -** Variations: stosb(), stosw(), stosl() -** -** Description: Store a specific value into destination buffer -** -** @param dst Destination buffer -** @param val Data to copy -** @param len Byte count -*/ -static inline void -stosb( void *dst, uint8_t val, uint32_t len ) OPSINLINED -{ - __asm__ __volatile__( "cld; rep stosb" - : "=D" (dst), "=c" (len) - : "0" (dst), "1" (len), "a" (val) - : "memory", "cc" ); -} - -static inline void -stosw( void *dst, uint16_t val, uint32_t len ) OPSINLINED -{ - __asm__ __volatile__( "cld; rep stos2" - : "=D" (dst), "=c" (len) - : "0" (dst), "1" (len), "a" (val) - : "memory", "cc" ); -} - -static inline void -stosl( void *dst, uint32_t val, uint32_t len ) OPSINLINED -{ - __asm__ __volatile__( "cld; rep stosl" - : "=D" (dst), "=c" (len) - : "0" (dst), "1" (len), "a" (val) - : "memory", "cc" ); -} - -/**************************** -** Special register access -****************************/ - -/** -** Register read functions -** -** Variations: r_cr0(), r_cr2(), r_cr3(), r_cr4(), r_eflags(), -** r_ebp(), r_esp() -** -** Description: Reads the register indicated by its name -** -** @return Contents of the register -*/ -static inline uint32_t -r_cr0( void ) OPSINLINED -{ - uint32_t val; - __asm__ __volatile__( "movl %%cr0,%0" : "=r" (val) ); - return val; -} - -static inline uint32_t -r_cr2( void ) OPSINLINED -{ - uint32_t val; - __asm__ __volatile__( "movl %%cr2,%0" : "=r" (val) ); - return val; -} - -static inline uint32_t -r_cr3( void ) OPSINLINED -{ - uint32_t val; - __asm__ __volatile__( "movl %%cr3,%0" : "=r" (val) ); - return val; -} - -static inline uint32_t -r_cr4( void ) OPSINLINED -{ - uint32_t val; - __asm__ __volatile__( "movl %%cr4,%0" : "=r" (val) ); - return val; -} - -static inline uint32_t -r_eflags(void) OPSINLINED -{ - uint32_t val; - __asm__ __volatile__( "pushfl; popl %0" : "=r" (val) ); - return val; -} - -static inline uint32_t -r_ebp(void) OPSINLINED -{ - uint32_t val; - __asm__ __volatile__( "movl %%ebp,%0" : "=r" (val) ); - return val; -} - -static inline uint32_t -r_esp(void) OPSINLINED -{ - uint32_t val; - __asm__ __volatile__( "movl %%esp,%0" : "=r" (val) ); - return val; -} - -/** -** Register write functions -** -** Variations: w_cr0(), w_cr2(), w_cr3(), w_cr4(), w_eflags() -** -** Description: Writes a value into the CR indicated by its name -*/ -static inline void -w_cr0( uint32_t val ) OPSINLINED -{ - __asm__ __volatile__( "movl %0,%%cr0" : : "r" (val) ); -} - -static inline void -w_cr2( uint32_t val ) OPSINLINED -{ - __asm__ __volatile__( "movl %0,%%cr2" : : "r" (val) ); -} - -static inline void -w_cr3( uint32_t val ) OPSINLINED -{ - __asm__ __volatile__( "movl %0,%%cr3" : : "r" (val) ); -} - -static inline void -w_cr4( uint32_t val ) OPSINLINED -{ - __asm__ __volatile__( "movl %0,%%cr4" : : "r" (val) ); -} - -static inline void -w_eflags(uint32_t eflags) OPSINLINED -{ - __asm__ __volatile__( "pushl %0; popfl" : : "r" (eflags) ); -} - -/** -** Descriptor table load functions -** -** Variations: w_gdt(), w_idt() -** -** Description: Load an address into the specified processor register -** -** @param addr The value to be loaded into the register -*/ -static inline void -w_gdt( void *addr ) OPSINLINED -{ - __asm__ __volatile__( "lgdt (%0)" : : "r" (addr) ); -} - -static inline void -w_idt( void *addr ) OPSINLINED -{ - __asm__ __volatile__( "lidt (%0)" : : "r" (addr) ); -} - -/** -** CPU ID access -** -** Description: Retrieve CPUID information -** -** @param op Value to be placed into %eax for the operation -** @param ap Pointer to where %eax contents should be saved, or NULL -** @param bp Pointer to where %ebx contents should be saved, or NULL -** @param cp Pointer to where %ecx contents should be saved, or NULL -** @param dp Pointer to where %edx contents should be saved, or NULL -*/ -static inline void -cpuid( uint32_t op, uint32_t *ap, uint32_t *bp, - uint32_t *cp, uint32_t *dp ) OPSINLINED -{ - uint32_t eax, ebx, ecx, edx; - __asm__ __volatile__( "cpuid" - : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) - : "a" (op) ); - - if( ap ) *ap = eax; - if( bp ) *bp = ebx; - if( cp ) *cp = ecx; - if( dp ) *dp = edx; -} - -/**************************** -** TLB management -****************************/ - -/** -** TLB invalidation for one page -** -** Description: Invalidate the TLB entry for an address -** -** @param addr An address within the page to be flushed -*/ -static inline void -invlpg( uint32_t addr ) OPSINLINED -{ - __asm__ __volatile__( "invlpg (%0)" : : "r" (addr) : "memory" ); -} - -/** -** TLB invalidation for all pages -** -** Description: Flush all entries from the TLB -** -** We do this by changing CR3. -*/ -static inline void -flushtlb( void ) OPSINLINED -{ - uint32_t cr3; - __asm__ __volatile__( "movl %%cr3,%0" : "=r" (cr3) ); - __asm__ __volatile__( "movl %0,%%cr2" : : "r" (cr3) ); -} - -/**************************** -** I/O instructions -****************************/ - -/** -** Name: inN -** -** Variations: inb(), inw(), inl() -** -** Description: Read some amount of data from the supplied I/O port -** -** @param port The i/o port to read from -** -** @return The data read from the specified port -*/ -static inline uint8_t -inb( int port ) OPSINLINED -{ - uint8_t data; - __asm__ __volatile__( "inb %w1,%0" : "=a" (data) : "d" (port) ); - return data; -} - -static inline uint16_t -inw( int port ) OPSINLINED -{ - uint16_t data; - __asm__ __volatile__( "inw %w1,%0" : "=a" (data) : "d" (port) ); - return data; -} - -static inline uint32_t -inl( int port ) OPSINLINED -{ - uint32_t data; - __asm__ __volatile__( "inl %w1,%0" : "=a" (data) : "d" (port) ); - return data; -} - -/** -** Name: outN -** -** Variations: outb(), outw(), outl() -** -** Description: Write some data to the specified I/O port -** -** @param port The i/o port to write to -** @param data The data to be written to the port -** -** @return The data read from the specified port -*/ -static inline void -outb( int port, uint8_t data ) OPSINLINED -{ - __asm__ __volatile__( "outb %0,%w1" : : "a" (data), "d" (port) ); -} - -static inline void -outw( int port, uint16_t data ) OPSINLINED -{ - __asm__ __volatile__( "outw %0,%w1" : : "a" (data), "d" (port) ); -} - -static inline void -outl( int port, uint32_t data ) OPSINLINED -{ - __asm__ __volatile__( "outl %0,%w1" : : "a" (data), "d" (port) ); -} - -/**************************** -** Miscellaneous instructions -****************************/ - -/** -** Name: breakpoint -** -** Description: Cause a breakpoint interrupt for debugging purposes -*/ -static inline void -breakpoint( void ) OPSINLINED -{ - __asm__ __volatile__( "int3" ); -} - -/** -** Name: get_ra -** -** Description: Get the return address for the calling function -** (i.e., where whoever called us will go back to) -** -** @return The address the calling routine will return to as a uint32_t -*/ -static inline uint32_t -get_ra( void ) OPSINLINED -{ - uint32_t val; - __asm__ __volatile__( "movl 4(%%ebp),%0" : "=r" (val) ); - return val; -} - -/** -** Name: ev_wait -** -** Description: Pause until something happens -*/ -static inline void -ev_wait( void ) OPSINLINED -{ - __asm__ __volatile__( "sti ; hlt" ); -} - - -/** -** Name: xchgl -** -** Description: Perform an atomic exchange with memory -** -** @param addr Memory location to be modified -** @param data Data to exchange -** -** @return The old contents of the memory location -*/ -static inline uint32_t -xchgl( volatile uint32_t *addr, uint32_t data ) OPSINLINED -{ - uint32_t old; - - // + indicates a read-modify-write operand - __asm__ __volatile__( "lock; xchgl %0, %1" - : "+m" (*addr), "=a" (old) - : "1" (data) - : "cc"); - return old; -} - -#endif /* !ASM_SRC */ - -#endif |