bac6068857
- current and maximum priority per process; - quantum size and current ticks left per process; - max number of full quantums in a row allow (otherwise current priority is decremented)
107 lines
3.7 KiB
C
Executable File
107 lines
3.7 KiB
C
Executable File
/* General constants used by the kernel. */
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#include <ibm/interrupt.h> /* interrupt numbers and hardware vectors */
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#include <ibm/ports.h> /* port addresses and magic numbers */
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#include <ibm/bios.h> /* BIOS addresses, sizes and magic numbers */
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#include <ibm/cpu.h> /* BIOS addresses, sizes and magic numbers */
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#include <minix/config.h>
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/* To translate an address in kernel space to a physical address. This is
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* the same as umap_local(proc_ptr, D, vir, sizeof(*vir)), but less costly.
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*/
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#define vir2phys(vir) (kinfo.data_base + (vir_bytes) (vir))
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/* Constants used in virtual_copy(). Values must be 0 and 1, respectively! */
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#define _SRC_ 0
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#define _DST_ 1
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/* Translate a pointer to a field in a structure to a pointer to the structure
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* itself. So it translates '&struct_ptr->field' back to 'struct_ptr'.
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*/
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#define structof(type, field, ptr) \
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((type *) (((char *) (ptr)) - offsetof(type, field)))
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/* How many bytes for the kernel stack. Space allocated in mpx.s. */
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#define K_STACK_BYTES 1024
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/* How long should the process names be in the kernel? */
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#define P_NAME_LEN 8
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/* Scheduling quantum. Number of ticks before preemption. */
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#define SCHED_MILLISEC 100 /* rate to call scheduler */
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#define SCHED_TICKS (SCHED_MILLISEC*HZ/1000) /* ticks per schedule */
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/* How many bytes should the circular buffer for kernel diagnostics. */
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#define KMESS_BUF_SIZE 256
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/* Maximum size in bytes for (port,value)-pairs vector to copy in. */
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#define VDEVIO_BUF_SIZE 64
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/* How many elements in vector of virtual copy requests. */
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#define VCOPY_VEC_SIZE 16
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/* How many IRQ hooks are there in total. */
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#define NR_IRQ_HOOKS 16
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/* How many buffers for notification messages should there be? */
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#define NR_NOTIFY_BUFS 32
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/* Buffer to gather randomness. How many entries before wrapping? */
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#define RANDOM_ELEMENTS 32
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/* Constants and macros for bit map manipulation. */
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#define BITCHUNK_BITS (sizeof(bitchunk_t) * CHAR_BIT)
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#define BITMAP_CHUNKS(nr_bits) (((nr_bits)+BITCHUNK_BITS-1)/BITCHUNK_BITS)
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#define MAP_CHUNK(map,bit) (map)[((bit)/BITCHUNK_BITS)]
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#define CHUNK_OFFSET(bit) ((bit)%BITCHUNK_BITS))
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#define GET_BIT(map,bit) ( MAP_CHUNK(map,bit) & (1 << CHUNK_OFFSET(bit) )
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#define SET_BIT(map,bit) ( MAP_CHUNK(map,bit) |= (1 << CHUNK_OFFSET(bit) )
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#define UNSET_BIT(map,bit) ( MAP_CHUNK(map,bit) &= ~(1 << CHUNK_OFFSET(bit) )
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#if (CHIP == INTEL)
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/* Program stack words and masks. */
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#define INIT_PSW 0x0200 /* initial psw */
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#define INIT_TASK_PSW 0x1200 /* initial psw for tasks (with IOPL 1) */
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#define TRACEBIT 0x0100 /* OR this with psw in proc[] for tracing */
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#define SETPSW(rp, new) /* permits only certain bits to be set */ \
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((rp)->p_reg.psw = (rp)->p_reg.psw & ~0xCD5 | (new) & 0xCD5)
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#define IF_MASK 0x00000200
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#define IOPL_MASK 0x003000
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#if ENABLE_LOCK_TIMING
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#define locktimestart(c, v) timer_start(c, v)
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#define locktimeend(c) timer_end(c)
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#else
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#define locktimestart(c, v)
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#define locktimeend(c)
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#endif
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#if ENABLE_K_LOCKCHECK
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#define lockcheck if(!(read_cpu_flags() & X86_FLAG_I)) kinfo.relocking++;
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#else
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#define lockcheck
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#endif
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/* Disable/Enable hardware interrupts. */
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#define lock(c, v) do { lockcheck; intr_disable(); locktimestart(c, v); } while(0)
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#define unlock(c) do { locktimeend(c); intr_enable(); } while(0)
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/* Sizes of memory tables. The boot monitor distinguishes three memory areas,
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* namely low mem below 1M, 1M-16M, and mem after 16M. More chunks are needed
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* for DOS MINIX.
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*/
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#define NR_MEMS 8 /* number of chunks of memory */
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#endif /* (CHIP == INTEL) */
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#if (CHIP == M68000)
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/* M68000 specific constants go here. */
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#endif /* (CHIP == M68000) */
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#if ENABLE_INT_TIMING
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#define INT_TIMING_BITS 12
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#define INT_TIMING_ELEMENTS (1L << 12)
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#endif
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