159 lines
6.4 KiB
C
159 lines
6.4 KiB
C
#ifndef PRIV_H
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#define PRIV_H
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/* Declaration of the system privileges structure. It defines flags, system
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* call masks, an synchronous alarm timer, I/O privileges, pending hardware
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* interrupts and notifications, and so on.
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* System processes each get their own structure with properties, whereas all
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* user processes share one structure. This setup provides a clear separation
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* between common and privileged process fields and is very space efficient.
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*
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* Changes:
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* Nov 22, 2009 rewrite of privilege management (Cristiano Giuffrida)
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* Jul 01, 2005 Created. (Jorrit N. Herder)
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*/
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#include <minix/com.h>
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#include <minix/const.h>
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#include "const.h"
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#include "type.h"
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/* Max. number of I/O ranges that can be assigned to a process */
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#define NR_IO_RANGE 64
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/* Max. number of device memory ranges that can be assigned to a process */
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#define NR_MEM_RANGE 20
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/* Max. number of IRQs that can be assigned to a process */
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#define NR_IRQ 8
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struct priv {
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proc_nr_t s_proc_nr; /* number of associated process */
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sys_id_t s_id; /* index of this system structure */
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short s_flags; /* PREEMTIBLE, BILLABLE, etc. */
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/* Asynchronous sends */
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vir_bytes s_asyntab; /* addr. of table in process' address space */
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size_t s_asynsize; /* number of elements in table. 0 when not in
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* use
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*/
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short s_trap_mask; /* allowed system call traps */
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sys_map_t s_ipc_to; /* allowed destination processes */
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/* allowed kernel calls */
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bitchunk_t s_k_call_mask[SYS_CALL_MASK_SIZE];
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endpoint_t s_sig_mgr; /* signal manager for system signals */
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sys_map_t s_notify_pending; /* bit map with pending notifications */
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irq_id_t s_int_pending; /* pending hardware interrupts */
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sigset_t s_sig_pending; /* pending signals */
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timer_t s_alarm_timer; /* synchronous alarm timer */
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struct far_mem s_farmem[NR_REMOTE_SEGS]; /* remote memory map */
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reg_t *s_stack_guard; /* stack guard word for kernel tasks */
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int s_nr_io_range; /* allowed I/O ports */
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struct io_range s_io_tab[NR_IO_RANGE];
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int s_nr_mem_range; /* allowed memory ranges */
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struct mem_range s_mem_tab[NR_MEM_RANGE];
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int s_nr_irq; /* allowed IRQ lines */
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int s_irq_tab[NR_IRQ];
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vir_bytes s_grant_table; /* grant table address of process, or 0 */
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int s_grant_entries; /* no. of entries, or 0 */
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};
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/* Guard word for task stacks. */
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#define STACK_GUARD ((reg_t) (sizeof(reg_t) == 2 ? 0xBEEF : 0xDEADBEEF))
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/* Static privilege id definitions. */
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#define NR_STATIC_PRIV_IDS NR_BOOT_PROCS
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#define is_static_priv_id(id) (id >= 0 && id < NR_STATIC_PRIV_IDS)
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#define static_priv_id(n) (NR_TASKS + (n))
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/* Magic system structure table addresses. */
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#define BEG_PRIV_ADDR (&priv[0])
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#define END_PRIV_ADDR (&priv[NR_SYS_PROCS])
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#define BEG_STATIC_PRIV_ADDR BEG_PRIV_ADDR
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#define END_STATIC_PRIV_ADDR (BEG_STATIC_PRIV_ADDR + NR_STATIC_PRIV_IDS)
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#define BEG_DYN_PRIV_ADDR END_STATIC_PRIV_ADDR
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#define END_DYN_PRIV_ADDR END_PRIV_ADDR
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#define priv_addr(i) (ppriv_addr)[(i)]
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#define priv_id(rp) ((rp)->p_priv->s_id)
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#define priv(rp) ((rp)->p_priv)
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#define id_to_nr(id) priv_addr(id)->s_proc_nr
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#define nr_to_id(nr) priv(proc_addr(nr))->s_id
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#define may_send_to(rp, nr) (get_sys_bit(priv(rp)->s_ipc_to, nr_to_id(nr)))
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/* Privilege management shorthands. */
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#define spi_to(n) (1 << (static_priv_id(n)))
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#define unset_usr_to(m) ((m) & ~(1 << USER_PRIV_ID))
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/* The system structures table and pointers to individual table slots. The
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* pointers allow faster access because now a process entry can be found by
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* indexing the psys_addr array, while accessing an element i requires a
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* multiplication with sizeof(struct sys) to determine the address.
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*/
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EXTERN struct priv priv[NR_SYS_PROCS]; /* system properties table */
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EXTERN struct priv *ppriv_addr[NR_SYS_PROCS]; /* direct slot pointers */
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/* Unprivileged user processes all share the privilege structure of the
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* root user process.
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* This id must be fixed because it is used to check send mask entries.
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*/
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#define USER_PRIV_ID static_priv_id(ROOT_USR_PROC_NR)
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/* Specifies a null privilege id.
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*/
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#define NULL_PRIV_ID (-1)
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/* Make sure the system can boot. The following sanity check verifies that
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* the system privileges table is large enough for the number of processes
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* in the boot image.
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*/
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#if (NR_BOOT_PROCS > NR_SYS_PROCS)
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#error NR_SYS_PROCS must be larger than NR_BOOT_PROCS
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#endif
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/*
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* Privileges masks used by the kernel.
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*/
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#define IDL_F (SYS_PROC | BILLABLE) /* idle task is not preemptible as we
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* don't want it to interfere with the
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* timer tick interrupt handler code.
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* Unlike other processes idle task is
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* handled in a special way and is
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* preempted always if timer tick occurs
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* and there is another runnable process
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*/
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#define TSK_F (SYS_PROC) /* other kernel tasks */
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#define RSYS_F (SYS_PROC | PREEMPTIBLE) /* root system proc */
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#define DEF_SYS_F (RSYS_F | DYN_PRIV_ID) /* default sys proc */
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/* allowed traps */
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#define CSK_T (1 << RECEIVE) /* clock and system */
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#define TSK_T 0 /* other kernel tasks */
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#define RSYS_T (~0) /* root system proc */
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#define DEF_SYS_T RSYS_T /* default sys proc */
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/* allowed targets */
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#define TSK_M 0 /* all kernel tasks */
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#define RSYS_M (~0) /* root system proc */
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#define DEF_SYS_M unset_usr_to(RSYS_M) /* default sys proc */
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/* allowed kernel calls */
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#define NO_C 0 /* no calls allowed */
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#define ALL_C 1 /* all calls allowed */
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#define TSK_KC NO_C /* all kernel tasks */
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#define RSYS_KC ALL_C /* root system proc */
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#define DEF_SYS_KC RSYS_KC /* default sys proc */
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/* signal manager */
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#define RSYS_SM ROOT_SYS_PROC_NR /* root system proc */
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#define DEF_SYS_SM ROOT_SYS_PROC_NR /* default sys proc */
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#endif /* PRIV_H */
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