95 lines
1.8 KiB
C
95 lines
1.8 KiB
C
//functions.h
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//05/07/03 Josh Holtrop
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//for HOS
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//Modified: 02/26/04
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#ifndef __HOS_FUNCTIONS__
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#define __HOS_FUNCTIONS__ __HOS_FUNCTIONS__
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#include "hos_defines.h"
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#include "sys/io.h"
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extern u32_t _code;
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extern u32_t _bss;
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extern u32_t _end;
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//Enables (SeTs) Interrupt Flag on the processor
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static inline void enable_ints()
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{
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asm("sti");
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}
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//Disables (CLears) Interrupt Flag on the processor
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static inline void disable_ints()
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{
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asm("cli");
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}
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//Restarts the computer
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static inline void restart()
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{
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enable_ints();
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byte temp;
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do
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{
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temp = inportb(0x64);
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if (temp & 1)
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inportb(0x60);
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} while(temp & 2);
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outportb (0x64, 0xfe);
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for (;;) {}
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}
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//Halts (freezes) the computer
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static inline void halt()
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{
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asm("cli");
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asm("hlt");
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while (1) ;
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}
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//Initializes 8253 Programmable Interrupt Timer
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static inline void timer_init()
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{
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//set timer : 2e9c = 100hz
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outportb(0x43, 0x34);
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outportb(0x40, 0x9c); //lsb
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outportb(0x40, 0x2e); //msb
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}
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//Returns the size of the kernel (code & data)
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// - this does include the bss section
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// - this should be 4kb aligned per the linker script
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// - this is the amount of RAM the kernel code, data, & bss take
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static inline u32_t kernel_size_used()
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{
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return (u32_t)(&_end)-(u32_t)(&_code);
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}
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//Returns the size of the kernel (code & data)
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// - this does not include the bss section
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// - this should be 4kb aligned per the linker script
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// - this should be the size of kernel.bin
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static inline u32_t kernel_size()
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{
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return (u32_t)(&_bss)-(u32_t)(&_code);
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}
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//converts a binary-coded-decimal byte to its decimal equivalent
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static inline byte bcd2byte(byte bcd)
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{
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return (10 * ((bcd & 0xF0) >> 4)) + (bcd & 0x0F);
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}
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//converts a binary-coded-decimal byte to its decimal equivalent
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static inline byte byte2bcd(byte bite)
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{
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return ((bite / 10) << 4) | (bite % 10);
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}
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#endif
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