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cpu.map.h
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1990-12-19
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/*
* cpu.map.h
*
* @(#)cpu.map.h 1.5 88/02/08 SMI
* Copyright (c) 1986 by Sun Microsystems, Inc.
*
* Memory Mapping and Paging on the Sun-4
*
* This file is used for both stand-alone code (ROM Monitor, Diagnostics,
* boot programs, etc.) and for the Unix kernel. IF YOU HAVE TO CHANGE IT
* to fit your application, MOVE THE CHANGE BACK TO THE PUBLIC COPY, and
* make sure the change is upward-compatible. The last thing we need is
* many different copies of this file.
*
* The context register selects among NUMCONTEXTS different address spaces
* (contexts). Each address space typically corresponds to a process and is
* 4G-bytes. Each memory access is translated through the address space
* indicated by the context register.
*
* The context register occupies a byte in control space, although only
* the low 4 bits are relevant. The high-order bits are ignored on writes,
* and return garbage on reads. You can mask the upper 4 bits with CONTEXTMASK.
*/
#define NUMCONTEXTS 16
#define CONTEXTMASK (NUMCONTEXTS-1) /* Relevant bits on read of cx reg */
/*
* The segment map determines which large pieces of the 4G-byte address space
* are actually in use. Each chunk of address space is mapped to a set of
* PGSPERSEG page map entries (pmegs). Chunks which are not in use should all
* be mapped to a single set of page map entries, which should prohibit
* all accesses.
*
* There are SEGSPERCONTEXT segment map entries in each logical context.
* There are NUMPMEGS total page map entry groups (pmegs) in the physical
* page map. Each segment map entry references a pmeg which contains
* the PGSPERSEG (number of page table entries per pmeg) pages defining
* that segment.
*
* Note that there is much more virtual address space (4G-bytes) as there
* is physical space mappable at one time (16384 x 8K ???). You can't map in
* 4G-bytes at once even if you have that much physical memory, since the page
* map is the bottleneck here. The solution is to "page" the page map entries
* in and out of the physical pmegs on demand.
*/
#define SEGSPERCONTEXT 4096
#define NUMPMEGS 512
#define PGSPERSEG 32 /* The number of pmegs associated *
* with each segment table entry. */
/*
* The following are valid in the pm_type field of the page map.
*/
enum pm_types {
VPM_MEMORY=0, /* Page is in main memory. */
VPM_IO=1, /* Page is on-board I/O. */
VPM_VME16=2, /* Page is on VME-bus, accessing 16-bit device.*/
VPM_VME32=3, /* Page is on VME-bus, accessing 32-bit device.*/
VPM_MEMORY_NOCACHE=4, /* Page is in main memory, but not cacheable. */
VPM_IO_NOCACHE=5 /* Page is in on-board I/O, but not cacheable. */
};
/*
* The following are valid in the pm_permissions field.
*/
enum pm_perm {
PMP_RO=0, /* Page is read-only by all (user and supervisor). */
PMP_RO_SUP=1, /* Page is read-only by supervisor. */
PMP_ALL=2, /* Page is read-write by all (user and supervisor).*/
PMP_SUP=3, /* Page is read-write by supervisor. */
};
struct pgmapent {
unsigned pm_valid :1; /* This entry is valid. */
enum pm_perm pm_permissions :2; /* Access privileges: write */
/* access? supervisor access? */
enum pm_types pm_type :3; /* don't cache and page type. */
unsigned pm_accessed :1; /* Page has been read. */
unsigned pm_modified :1; /* Page has been written. */
unsigned pm_reserved :5; /* Reserved. */
unsigned pm_page :19; /* Page # in physical memory. */
};
/*
* The page map gives fine-grain control over memory allocation. Each page
* map entry controls BYTESPERPG (a page) of memory. Each page can be mapped
* to memory, I/O, or a global bus (e.g. VME-bus), or can be inaccessible.
* Each page can be protected against user access and can be made readable
* or readable and writable. If access is denied, the page referenced and
* modified bits will not be changed, nor will the page number or type fields
* be used; so they can be used by software.
*/
#define BYTESPERPG 8192
#define BYTESPERSEG (BYTESPERPG*PGSPERSEG)
#define BYTES_PG_SHIFT 13
#define PMREALBITS 0xFF07FFFF /* Which are actually implemented. Mask *
* out 5 Reserved bits. */
/*
* When the page type is PM_IO, the PAGE NUMBER field selects
* which of the main I/O device chips is being selected. Low-order (non-
* mapped) address bits connect to the address lines of the device and
* determine which facility of the device is being accessed.
*
* Type 1 devices and their corresponding page number.
*/
#define VIOPG_KBM 0x78000 /* Dual serial Z8530 SCC for keyboard&mouse */
#define VIOPG_SERIAL0 0x78800 /* Dual serial Z8530 SCC */
#define VIOPG_EEPROM 0x79000 /* Non-volatile memory (EEPROM) */
#define VIOPG_CLOCK 0x79800 /* Intersil 7170 time-of-day clock */
#define VIOPG_MEMORY_ERR 0x7a000 /* CPU Memory Error registers */
#define VIOPG_INTERRUPT 0x7a800 /* Interrupt control register */
#define VIOPG_ETHER 0x7b000 /* Intel 82586 Ethernet interface */
#define VIOPG_COLORMAP 0x7b800 /* Color Map for onboard video someday */
#define VIOPG_PROM 0x7c000 /* Bootstrap proms (EPROM) */
#define VIOPG_AMD_ETHER 0x7c800 /* AMD Ethernet interface */
#define VIOPG_SCSI 0x7d000 /* Onboard SCSI interface */
/* 0x7d800 * Reserved */
/* 0x7e000 * Reserved */
#define VIOPG_VIDEO 0x7e800 /* video RAM */
#define VIOPG_DES 0x7f000 /* AMD 8068 data ciphering processor */
#define VIOPG_ECC_CTRL 0x7f8f0 /* ECC Control Register access */
/*
* For new "setupmap" routine in file "mapmem.c".
*/
#define VIOPAGE_INVALID 0x70000000 /* Invalid page table entry. */
#define VIOPAGE_KBM 0xd4078000 /* Dual serial Z8530 SCC for *
* keyboard&mouse */
#define VIOPAGE_SERIAL0 0xd4078800 /* Dual serial Z8530 SCC */
#define VIOPAGE_EEPROM 0xd4079000 /* Non-volatile memory (EEPROM) */
#define VIOPAGE_CLOCK 0xd4079800 /* Intersil 7170 time-of-day clock */
#define VIOPAGE_MEMORY_ERR 0xd407a000 /* CPU Memory Error registers */
#define VIOPAGE_INTERRUPT 0xd407a800 /* Interrupt control register */
#define VIOPAGE_ETHER 0xd407b000 /* Intel 82586 Ethernet interface */
#define VIOPAGE_COLORMAP 0xd407b800 /* Color Map for onboard video someday*/
#define VIOPAGE_PROM 0xd407c000 /* Bootstrap proms (EPROM) */
#define VIOPAGE_AMD_ETHER 0xd407c800 /* AMD Ethernet interface */
#define VIOPAGE_SCSI 0xd407d000 /* Onboard SCSI interface */
/* 0xd407d800 * Reserved */
/* 0xd407e000 * Reserved */
#define VIOPAGE_VIDEO 0xd407e800 /* video RAM */
#ifdef COBRA
#define VIOPAGE_ENA_PLANE 0xd407ea00 /* cobra video enable plane */
#define VIOPAGE_CFB 0xd407ec00 /* cobra color frame buffer */
#endif COBRA
#define VIOPAGE_DES 0xd407f000 /* AMD 8068 data ciphering processor */
#define VIOPAGE_ECC_CTRL 0xd407f8f0 /* ECC Control Register access */
#ifndef COBRA /* no VME in cobra */
/*
* Other special page numbers.
*/
#define VMEPG_24ADDR (0xFF000000 >> BYTES_PG_SHIFT) /* 24-bit addr VME */
#define VMEPG_16ADDR (0xFFFF0000 >> BYTES_PG_SHIFT) /* 16-bit addr VME */
#define VME_COLOR_PHYS 0xFF400000 /* Base addr (not pg#) of VME color */
#define VPM_VME_COLOR VPM_VME16 /* Page type for VME color */
#define VMEPG_COLOR (VME_COLOR_PHYS >> BYTES_PG_SHIFT)
#endif COBRA
#ifdef COBRA
#define MONBEG 0xFFB00000 /* 2Mbytes before MONSTART to
* accomodate color frame buffer and
* enable plane. */
#else COBRA
#define MONBEG MONSTART
#endif COBRA
/*
* The maps are accessed from supervisor state.
*
* The following defines the encodings for the various address spaces used
* by "movs".
*/
#define SEGMAPADR(addr) (char *)(((int)addr&MAPADDRMASK))
#define PAGEMAPADR(addr)(long *)(((int)addr&MAPADDRMASK))
#define IDPROMOFF 0x00000000 /* ID Prom */
#define CONTEXTOFF 0x30000000 /* Context registers */
#define ENABLEOFF 0x40000000 /* System Enable Reg -- turns me on */
#ifndef COBRA /* no user DVMA in cobra */
#define UDMAENABLEOFF 0x50000000 /* User DVMA Enable Reg */
#endif COBRA
#define BUSERROFF 0x60000000 /* Bus Error Register - tells why */
#define LEDOFF 0x70000000 /* LED's for diagnostics -- 0=lit */
#define SERIALOFF 0xF0000000 /* Serial port bypass for diagnostics */
#define MAPADDRMASK 0xFFFFE000 /* Keeps bits relevant to map entry */
/*
* The following subroutines accept any address in the mappable range.
* They access the map for the current context. They assume that we are
* currently running in supervisor state.
*
* We can't declare getpgmap() as returning a struct, because our C compiler
* is brain damaged and returns a pointer to a static area if you return a
* struct. We therefore return an int and require the caller to set up
* unions and other assorted random hacks because the language implementation
* doesn't support structures returned from reentrant routines.
*/
extern int getpgmap(); /* (addr) */
extern int setpgmap(); /* (addr, entry) */
extern unsigned short getsegmap(); /* (addr) (unsigned short is returned)*/
extern int setsegmap(); /* (addr, entry) */
extern unsigned char getsupcontext(); /* () (unsigned char is returned) */
extern int setsupcontext(); /* (entry) */
extern unsigned char getusercontext(); /* () (unsigned char is returned) */
extern int setusercontext(); /* (entry) */