728f0f0c49
* Userspace change to use the new kernel calls - _taskcall(SYSTASK...) changed to _kernel_call(...) - int 32 reused for the kernel calls - _do_kernel_call() to make the trap to kernel - kernel_call() to make the actuall kernel call from C using _do_kernel_call() - unlike ipc call the kernel call always succeeds as kernel is always available, however, kernel may return an error * Kernel side implementation of kernel calls - the SYSTEm task does not run, only the proc table entry is preserved - every data_copy(SYSTEM is no data_copy(KERNEL - "locking" is an empty operation now as everything runs in kernel - sys_task() is replaced by kernel_call() which copies the message into kernel, dispatches the call to its handler and finishes by either copying the results back to userspace (if need be) or by suspending the process because of VM - suspended processes are later made runnable once the memory issue is resolved, picked up by the scheduler and only at this time the call is resumed (in fact restarted) which does not need to copy the message from userspace as the message is already saved in the process structure. - no ned for the vmrestart queue, the scheduler will restart the system calls - no special case in do_vmctl(), all requests remove the RTS_VMREQUEST flag
88 lines
2.9 KiB
C
88 lines
2.9 KiB
C
#ifndef GLO_H
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#define GLO_H
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/* Global variables used in the kernel. This file contains the declarations;
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* storage space for the variables is allocated in table.c, because EXTERN is
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* defined as extern unless the _TABLE definition is seen. We rely on the
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* compiler's default initialization (0) for several global variables.
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*/
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#ifdef _TABLE
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#undef EXTERN
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#define EXTERN
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#endif
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#include <minix/config.h>
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#include <archtypes.h>
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#include "config.h"
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#include "debug.h"
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/* Kernel information structures. This groups vital kernel information. */
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EXTERN struct kinfo kinfo; /* kernel information for users */
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EXTERN struct machine machine; /* machine information for users */
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EXTERN struct kmessages kmess; /* diagnostic messages in kernel */
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EXTERN struct k_randomness krandom; /* gather kernel random information */
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EXTERN struct loadinfo kloadinfo; /* status of load average */
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/* Process scheduling information and the kernel reentry count. */
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EXTERN struct proc *proc_ptr; /* pointer to currently running process */
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EXTERN struct proc *bill_ptr; /* process to bill for clock ticks */
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EXTERN struct proc *vmrequest; /* first process on vmrequest queue */
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EXTERN struct proc *pagefaults; /* first process on pagefault queue */
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EXTERN unsigned lost_ticks; /* clock ticks counted outside clock task */
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/* Interrupt related variables. */
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EXTERN irq_hook_t irq_hooks[NR_IRQ_HOOKS]; /* hooks for general use */
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EXTERN int irq_actids[NR_IRQ_VECTORS]; /* IRQ ID bits active */
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EXTERN int irq_use; /* map of all in-use irq's */
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EXTERN u32_t system_hz; /* HZ value */
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/* Miscellaneous. */
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EXTERN reg_t mon_ss, mon_sp; /* boot monitor stack */
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EXTERN int mon_return; /* true if we can return to monitor */
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EXTERN int do_serial_debug;
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EXTERN time_t boottime;
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EXTERN char params_buffer[512]; /* boot monitor parameters */
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EXTERN int minix_panicing;
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EXTERN int locklevel;
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EXTERN char fpu_presence;
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EXTERN char osfxsr_feature; /* FXSAVE/FXRSTOR instructions support (SSEx) */
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#define MAGICTEST 0xC0FFEE23
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EXTERN u32_t magictest; /* global magic number */
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#if DEBUG_TRACE
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EXTERN int verboseflags;
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#endif
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#ifdef CONFIG_APIC
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EXTERN int config_no_apic; /* optionaly turn off apic */
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#endif
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#ifdef CONFIG_IDLE_TSC
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EXTERN u64_t idle_tsc;
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EXTERN u64_t idle_stop;
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EXTERN int idle_active;
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#endif
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EXTERN unsigned cpu_hz[CONFIG_MAX_CPUS];
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#define cpu_set_freq(cpu, freq) do {cpu_hz[cpu] = freq;} while (0)
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#define cpu_get_freq(cpu) cpu_hz[cpu]
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/* VM */
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EXTERN int vm_running;
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EXTERN int catch_pagefaults;
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EXTERN struct proc *ptproc;
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/* Timing */
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EXTERN util_timingdata_t timingdata[TIMING_CATEGORIES];
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/* Variables that are initialized elsewhere are just extern here. */
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extern struct boot_image image[]; /* system image processes */
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extern char *t_stack[]; /* task stack space */
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extern struct segdesc_s gdt[]; /* global descriptor table */
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EXTERN volatile int serial_debug_active;
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#endif /* GLO_H */
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