KERNEL CHANGES: - The kernel only knows about privileges of kernel tasks and the root system process (now RS). - Kernel tasks and the root system process are the only processes that are made schedulable by the kernel at startup. All the other processes in the boot image don't get their privileges set at startup and are inhibited from running by the RTS_NO_PRIV flag. - Removed the assumption on the ordering of processes in the boot image table. System processes can now appear in any order in the boot image table. - Privilege ids can now be assigned both statically or dynamically. The kernel assigns static privilege ids to kernel tasks and the root system process. Each id is directly derived from the process number. - User processes now all share the static privilege id of the root user process (now INIT). - sys_privctl split: we have more calls now to let RS set privileges for system processes. SYS_PRIV_ALLOW / SYS_PRIV_DISALLOW are only used to flip the RTS_NO_PRIV flag and allow / disallow a process from running. SYS_PRIV_SET_SYS / SYS_PRIV_SET_USER are used to set privileges for a system / user process. - boot image table flags split: PROC_FULLVM is the only flag that has been moved out of the privilege flags and is still maintained in the boot image table. All the other privilege flags are out of the kernel now. RS CHANGES: - RS is the only user-space process who gets to run right after in-kernel startup. - RS uses the boot image table from the kernel and three additional boot image info table (priv table, sys table, dev table) to complete the initialization of the system. - RS checks that the entries in the priv table match the entries in the boot image table to make sure that every process in the boot image gets schedulable. - RS only uses static privilege ids to set privileges for system services in the boot image. - RS includes basic memory management support to allocate the boot image buffer dynamically during initialization. The buffer shall contain the executable image of all the system services we would like to restart after a crash. - First step towards decoupling between resource provisioning and resource requirements in RS: RS must know what resources it needs to restart a process and what resources it has currently available. This is useful to tradeoff reliability and resource consumption. When required resources are missing, the process cannot be restarted. In that case, in the future, a system flag will tell RS what to do. For example, if CORE_PROC is set, RS should trigger a system-wide panic because the system can no longer function correctly without a core system process. PM CHANGES: - The process tree built at initialization time is changed to have INIT as root with pid 0, RS child of INIT and all the system services children of RS. This is required to make RS in control of all the system services. - PM no longer registers labels for system services in the boot image. This is now part of RS's initialization process.
206 lines
5.5 KiB
C
206 lines
5.5 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_GETINFO
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*
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* The parameters for this kernel call are:
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* m1_i3: I_REQUEST (what info to get)
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* m1_p1: I_VAL_PTR (where to put it)
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* m1_i1: I_VAL_LEN (maximum length expected, optional)
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* m1_p2: I_VAL_PTR2 (second, optional pointer)
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* m1_i2: I_VAL_LEN2_E (second length or process nr)
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*/
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#include <string.h>
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#include <minix/endpoint.h>
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#include "../system.h"
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#include "../vm.h"
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#if USE_GETINFO
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/*===========================================================================*
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* do_getinfo *
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*===========================================================================*/
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PUBLIC int do_getinfo(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Request system information to be copied to caller's address space. This
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* call simply copies entire data structures to the caller.
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*/
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size_t length;
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vir_bytes src_vir;
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int proc_nr, nr_e, nr, r;
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struct proc *caller;
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int wipe_rnd_bin = -1;
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struct exec e_hdr;
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caller = proc_addr(who_p);
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/* Set source address and length based on request type. */
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switch (m_ptr->I_REQUEST) {
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case GET_MACHINE: {
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length = sizeof(struct machine);
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src_vir = (vir_bytes) &machine;
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break;
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}
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case GET_KINFO: {
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length = sizeof(struct kinfo);
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src_vir = (vir_bytes) &kinfo;
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break;
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}
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case GET_LOADINFO: {
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length = sizeof(struct loadinfo);
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src_vir = (vir_bytes) &kloadinfo;
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break;
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}
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case GET_HZ: {
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length = sizeof(system_hz);
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src_vir = (vir_bytes) &system_hz;
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break;
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}
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case GET_IMAGE: {
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length = sizeof(struct boot_image) * NR_BOOT_PROCS;
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src_vir = (vir_bytes) image;
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break;
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}
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case GET_IRQHOOKS: {
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length = sizeof(struct irq_hook) * NR_IRQ_HOOKS;
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src_vir = (vir_bytes) irq_hooks;
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break;
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}
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case GET_PROCTAB: {
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length = sizeof(struct proc) * (NR_PROCS + NR_TASKS);
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src_vir = (vir_bytes) proc;
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break;
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}
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case GET_PRIVTAB: {
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length = sizeof(struct priv) * (NR_SYS_PROCS);
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src_vir = (vir_bytes) priv;
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break;
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}
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case GET_PROC: {
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nr_e = (m_ptr->I_VAL_LEN2_E == SELF) ?
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who_e : m_ptr->I_VAL_LEN2_E;
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if(!isokendpt(nr_e, &nr)) return EINVAL; /* validate request */
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length = sizeof(struct proc);
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src_vir = (vir_bytes) proc_addr(nr);
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break;
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}
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case GET_PRIV: {
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nr_e = (m_ptr->I_VAL_LEN2_E == SELF) ?
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who_e : m_ptr->I_VAL_LEN2_E;
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if(!isokendpt(nr_e, &nr)) return EINVAL; /* validate request */
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length = sizeof(struct priv);
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src_vir = (vir_bytes) priv_addr(nr_to_id(nr));
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break;
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}
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case GET_WHOAMI: {
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int len;
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/* GET_WHOAMI uses m3 and only uses the message contents for info. */
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m_ptr->GIWHO_EP = caller->p_endpoint;
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len = MIN(sizeof(m_ptr->GIWHO_NAME), sizeof(caller->p_name))-1;
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strncpy(m_ptr->GIWHO_NAME, caller->p_name, len);
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m_ptr->GIWHO_NAME[len] = '\0';
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return OK;
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}
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case GET_MONPARAMS: {
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src_vir = (vir_bytes) params_buffer;
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length = sizeof(params_buffer);
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break;
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}
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case GET_RANDOMNESS: {
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static struct k_randomness copy; /* copy to keep counters */
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int i;
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copy = krandom;
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for (i= 0; i<RANDOM_SOURCES; i++) {
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krandom.bin[i].r_size = 0; /* invalidate random data */
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krandom.bin[i].r_next = 0;
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}
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length = sizeof(copy);
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src_vir = (vir_bytes) ©
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break;
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}
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case GET_RANDOMNESS_BIN: {
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int i, bin = m_ptr->I_VAL_LEN2_E;
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if(bin < 0 || bin >= RANDOM_SOURCES) {
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kprintf("SYSTEM: GET_RANDOMNESS_BIN: %d out of range\n", bin);
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return EINVAL;
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}
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if(krandom.bin[bin].r_size < RANDOM_ELEMENTS)
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return ENOENT;
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length = sizeof(krandom.bin[bin]);
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src_vir = (vir_bytes) &krandom.bin[bin];
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wipe_rnd_bin = bin;
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break;
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}
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case GET_KMESSAGES: {
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length = sizeof(struct kmessages);
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src_vir = (vir_bytes) &kmess;
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break;
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}
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#if DEBUG_TIME_LOCKS
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case GET_LOCKTIMING: {
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length = sizeof(timingdata);
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src_vir = (vir_bytes) timingdata;
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break;
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}
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#endif
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case GET_IRQACTIDS: {
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length = sizeof(irq_actids);
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src_vir = (vir_bytes) irq_actids;
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break;
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}
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case GET_IDLETSC: {
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#ifdef CONFIG_IDLE_TSC
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length = sizeof(idle_tsc);
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src_vir = (vir_bytes) &idle_tsc;
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break;
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#else
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kprintf("do_getinfo: kernel not compiled with CONFIG_IDLE_TSC\n");
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return(EINVAL);
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#endif
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}
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case GET_AOUTHEADER: {
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int hdrindex, index = m_ptr->I_VAL_LEN2_E;
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if(index < 0 || index >= NR_BOOT_PROCS) {
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return EINVAL;
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}
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if (iskerneln(_ENDPOINT_P(image[index].endpoint))) {
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hdrindex = 0;
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} else {
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hdrindex = 1 + index-NR_TASKS;
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}
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arch_get_aout_headers(hdrindex, &e_hdr);
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length = sizeof(e_hdr);
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src_vir = (vir_bytes) &e_hdr;
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break;
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}
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default:
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kprintf("do_getinfo: invalid request %d\n", m_ptr->I_REQUEST);
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return(EINVAL);
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}
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/* Try to make the actual copy for the requested data. */
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if (m_ptr->I_VAL_LEN > 0 && length > m_ptr->I_VAL_LEN) return (E2BIG);
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r = data_copy_vmcheck(SYSTEM, src_vir, who_e,
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(vir_bytes) m_ptr->I_VAL_PTR, length);
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if(r != OK) return r;
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if(wipe_rnd_bin >= 0 && wipe_rnd_bin < RANDOM_SOURCES) {
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krandom.bin[wipe_rnd_bin].r_size = 0;
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krandom.bin[wipe_rnd_bin].r_next = 0;
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}
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return(OK);
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}
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#endif /* USE_GETINFO */
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