BSD 4_2 development

[unix-history] / usr / src / sys / vax / pcb.h

/*      pcb.h   6.1     83/07/29        */

/*
* VAX process control block
*/

struct pcb
{
       int     pcb_ksp;        /* kernel stack pointer */
       int     pcb_esp;        /* exec stack pointer */
       int     pcb_ssp;        /* supervisor stack pointer */
       int     pcb_usp;        /* user stack pointer */
       int     pcb_r0; 
       int     pcb_r1; 
       int     pcb_r2; 
       int     pcb_r3; 
       int     pcb_r4; 
       int     pcb_r5; 
       int     pcb_r6; 
       int     pcb_r7; 
       int     pcb_r8; 
       int     pcb_r9; 
       int     pcb_r10; 
       int     pcb_r11; 
       int     pcb_r12; 
#define pcb_ap pcb_r12
       int     pcb_r13; 
#define pcb_fp pcb_r13
       int     pcb_pc;         /* program counter */
       int     pcb_psl;        /* program status longword */
       struct  pte *pcb_p0br;  /* seg 0 base register */
       int     pcb_p0lr;       /* seg 0 length register and astlevel */
       struct  pte *pcb_p1br;  /* seg 1 base register */
       int     pcb_p1lr;       /* seg 1 length register and pme */
/*
* Software pcb (extension)
*/
       int     pcb_szpt;       /* number of pages of user page table */
       int     pcb_cmap2;
       int     *pcb_sswap;
       int     pcb_sigc[4];
};

#define AST_NONE        0x04000000      /* ast level */
#define AST_USER        0x03000000      /* ast for user mode */

#define ASTLVL_NONE     4
#define ASTLVL_USER     3

#define AST_CLR         0x07000000
#define PME_CLR         0x80000000

#define aston() \
       { \
               u.u_pcb.pcb_p0lr = (u.u_pcb.pcb_p0lr &~ AST_CLR) | AST_USER; \
               mtpr(ASTLVL, ASTLVL_USER); \
       }

#define astoff() \
       { \
               u.u_pcb.pcb_p0lr = (u.u_pcb.pcb_p0lr &~ AST_CLR) | AST_NONE; \
               mtpr(ASTLVL, ASTLVL_NONE); \
       }