Re: VAX RPB (Restart Parameter Block)

[Holm Tiffe <holm%freibergnet.de@localhost>]

Holm Tiffe wrote:

> Since I want to post mortem debug my broken netbsd kernels with that scn
> driver, that auto restart at a halt instruction is annoying.
> 
> As I wrote before I've set HALT to 3 before booting, but when the kernel
> is crashing it is set to 0 automagically.
> 
> The Netbsd bootloader is faking an RPB in autoconf.c:
> -----------------------------------------------------------------------
> long *bootregs;
> 
> /*
>  * Do some initial setup. Also create a fake RPB for net-booted machines
>  * that don't have an in-prom VMB.
>  */
> 
> void
> autoconf(void)
> {
>         int copyrpb = 1;
>         int fromnet = (bootregs[12] != -1);
> 
>         findcpu(); /* Configures CPU variables */
>         consinit(); /* Allow us to print out things */
>         scbinit(); /* Fix interval clock etc */
> 
> #define Holm
> #ifdef Holm
> 
>         vax_siedata = *(int *)(0x20040004);     /* SIE address */
>         vax_boardtype |= vax_siedata >> 24;
>         printf("\nvax_boardtype(sie): %x\n",vax_boardtype);
> #endif
> 
> 
> #ifdef DEV_DEBUG
>         printf("\nRegister contents:\n");
>         for (copyrpb = 0; copyrpb < 13; copyrpb++)
>                 printf("r%d: %lx\n", copyrpb, bootregs[copyrpb]);
> #endif
>         switch (vax_boardtype) {
> 
>         case VAX_BTYP_780:
>         case VAX_BTYP_790:
>         case VAX_BTYP_8000:
>         case VAX_BTYP_9CC:
>         case VAX_BTYP_9RR:
>         case VAX_BTYP_1202:
>                 if (fromnet == 0)
>                         break;
>                 copyrpb = 0;
>                 bootrpb.devtyp = bootregs[0];
>                 bootrpb.adpphy = bootregs[1];
>                 bootrpb.csrphy = bootregs[2];
>                 bootrpb.unit = bootregs[3];
>                 bootrpb.rpb_bootr5 = bootregs[5];
>                 bootrpb.pfncnt = 0;
>                 break;
> 
>                 break;
> 
>         case VAX_BTYP_RT300:
>                 if (fromnet == 0)
>                         break;
>                 copyrpb = 0;
>                 bootrpb.devtyp = 100;
>                 bootrpb.csrphy = 0x20008000;
>                 bootrpb.unit = 0;
>                 bootrpb.pfncnt = 0;
>                 break;
> 
> -----------------------------------------------------------------------
> 
> ...and I think that the behavior with the reboot has something todo with
> that "bootregs".
> 
> so I've looked at the ../../include/rpb.h file:
> 
> -----------------------------------------------------------------------
> /*
>  * Look at "VAX/VMS Internals and Data Structures" around page 907
>  * to get more info about RPB.
>  */
> 
> struct rpb {            /* size         description */
>         struct rpb *rpb_base;   /* 4  physical base address of block */
>         void  (*rpb_restart)(void);/* 4  physical address of restart
> routine */
>         long    rpb_chksum;/* 4  checksum of first 31 longwords of restart
> */
>         long    rpb_rstflg;     /* 4  Restart in progress flag */
>         long    rpb_haltpc;     /* 4  PC at HALT/restart */
>                         /* offset: 20 */
>         long    rpb_haltpsl;/* 4  PSL at HALT/restart */
>         long    rpb_haltcode;/* 4  reason for restart */
>         long    rpb_bootr0;/* 24  Saved bootstrap parameters (R0 through R5) 
> */
>         long    rpb_bootr1;
>         long    rpb_bootr2;
>         long    rpb_bootr3;
>         long    rpb_bootr4;
>         long    rpb_bootr5;
>         long    iovec;  /* 4  Address of bootstrap driver */
>         long    iovecsz;/* 4  Size (in bytes) of bootstrap driver */
>                         /* offset: 60 */
>         long    fillbn; /* 4  LBN of seconday bootstrap file */
>         long    filsiz; /* 4  Size (in blocks) of seconday bootstrap file
> */
>         long    pfnmap[2];      /* 8  Descriptor of PFN bitmap */
>         long    pfncnt; /* 4  Count of physical pages */
>                         /* offset: 80 */
>         long    svaspt; /* 4  system virtual address of system page table
> */
>         long    csrphy; /* 4  Physical Address of UBA device CSR */
>         long    csrvir; /* 4  Virtual Address of UBA device CSR */
>         long    adpphy; /* 4  Physical Address of adapter configurate reg.
> */
>         long    adpvir; /* 4  Virtual Address of adapter configurate reg.
> */
> -----------------------------------------------------------------------
> 
> ...and so I need to know a little more.
> Above in rpb.h is the hint about that
> 
> Look at  "VAX/VMS Internals and Data Structures" around page 907
> 
> But this manual seems to be not existing as PDF or so.
> Does anyone have this on paper and could please doo a look at it?
> 
> I want to know if the "HALT" Value from the firmware loader is lokated
> somewhere in the rpb astructure so I can it set right in the loader.
> I thought it is set somewhere in the 24 saved values and enabled
> DEV_DEBUG while building,  but I can see nowhere a "3" in the
> registers at the start auf the autoconf:
> -----------------------------------------------------------------------
> 2..1..0..
> vax_boardtype(sie): a000009
> 
> Register contents:
> r0: 20042f75
> r1: ffea00
> r2: 1000
> r3: ffba00
> r4: 0
> r5: 0
> r6: 0
> r7: 3fe6a8
> r8: 800
> r9: 1800
> r10: 1800
> r11: 0
> r12: 200
> -----------------------------------------------------------------------
> 
> Or what is that rpb_rstflag meaning, I read somewhere in the rtVAX manual
> that a restart should be prevented when the booted Os is broken (for
> debugging purposes).
> 
> THX,
> 
> Holm
> 
> 
> -- 


Ok... found the manual on bitsavers.

Regards,

Holm
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