f0594a9e6d
sys_privctl() call to dynamically start servers and drivers. - Shutdown sequence slightly adjusted: called as watchdog timer to let the busy sys_abort() call from the PM return first. - Changed umap_bios() to have more restrictive check: BIOS memory is now allowed in BIOS_MEM_BEGIN to END (interrupt vectors) and BASE_MEM_TOP to UPPER_MEM_END. Hopefully this keeps QEMU and Bochs happy.
55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_ABORT
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*
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* The parameters for this system call are:
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* m1_i1: ABRT_HOW (how to abort, possibly fetch monitor params)
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* m1_i2: ABRT_MON_PROC (proc nr to get monitor params from)
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* m1_i3: ABRT_MON_LEN (length of monitor params)
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* m1_p1: ABRT_MON_ADDR (virtual address of params)
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*/
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#include "../system.h"
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#include <unistd.h>
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#if USE_ABORT
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/*===========================================================================*
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* do_abort *
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*===========================================================================*/
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PUBLIC int do_abort(m_ptr)
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message *m_ptr; /* pointer to request message */
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{
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/* Handle sys_abort. MINIX is unable to continue. This can originate in the
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* PM (normal abort or panic) or FS (panic), or TTY (user issued CTRL-ALT-DEL
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* or ESC after debugging dumps).
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*/
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int how = m_ptr->ABRT_HOW;
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timer_t *tp;
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/* See if the monitor is to run the specified instructions. */
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if (how == RBT_MONITOR) {
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int proc_nr = m_ptr->ABRT_MON_PROC;
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int length = m_ptr->ABRT_MON_LEN + 1;
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vir_bytes src_vir = (vir_bytes) m_ptr->ABRT_MON_ADDR;
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phys_bytes src_phys = numap_local(proc_nr, src_vir, length);
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/* Validate length and address of shutdown code before copying. */
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if (length > kinfo.params_size || src_phys == 0)
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phys_copy(vir2phys("delay;boot"), kinfo.params_base, 11);
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else
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phys_copy(src_phys, kinfo.params_base, (phys_bytes) length);
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}
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/* Set a watchdog timer to shut down, so that this call returns first.
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* The timer will expire at the next clock tick, which can be any moment.
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* The CLOCK task is only scheduled when the SYSTEM task is done, though.
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*/
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tp = &priv(proc_addr(KERNEL))->s_alarm_timer;
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tmr_arg(tp)->ta_int = how; /* pass status as timer argument */
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set_timer(tp, get_uptime(), prepare_shutdown);
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return(OK); /* pro-forma (really EDISASTER) */
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}
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#endif /* USE_ABORT */
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