summaryrefslogtreecommitdiff
path: root/include/x86/ops.h
diff options
context:
space:
mode:
authorFreya Murphy <freya@freyacat.org>2025-04-03 12:29:48 -0400
committerFreya Murphy <freya@freyacat.org>2025-04-03 12:29:48 -0400
commit33b9d606916f3847e0f754693ca49ce56175a330 (patch)
treeeba26ad7722349ced40270f4a9a8083a58a7d453 /include/x86/ops.h
parenttrack changes (diff)
downloadcomus-33b9d606916f3847e0f754693ca49ce56175a330.tar.gz
comus-33b9d606916f3847e0f754693ca49ce56175a330.tar.bz2
comus-33b9d606916f3847e0f754693ca49ce56175a330.zip
refactor include
Diffstat (limited to 'include/x86/ops.h')
-rw-r--r--include/x86/ops.h395
1 files changed, 0 insertions, 395 deletions
diff --git a/include/x86/ops.h b/include/x86/ops.h
deleted file mode 100644
index 81167a1..0000000
--- a/include/x86/ops.h
+++ /dev/null
@@ -1,395 +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