/* $NetBSD: pmap_bootstrap.c,v 1.116 2026/06/13 15:28:09 thorpej Exp $ */ /* * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)pmap_bootstrap.c 8.1 (Berkeley) 6/10/93 */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: pmap_bootstrap.c,v 1.116 2026/06/13 15:28:09 thorpej Exp $"); #include "opt_ddb.h" #include "opt_kgdb.h" #include "opt_m68k_arch.h" #include <sys/param.h> #include <sys/systm.h> #include <sys/reboot.h> #include <uvm/uvm_extern.h> #include <machine/cpu.h> #include <machine/pte.h> #include <machine/vmparam.h> #include <machine/pmap.h> #include <machine/autoconf.h> #include <machine/video.h> #include <mac68k/mac68k/macrom.h> #define PA2VA(v, t) (t)((u_int)(v) - firstpa) extern char *etext; extern char *extiobase; extern vaddr_t kernel_reloc_offset; extern int vidlen; extern vaddr_t newvideoaddr; extern void * ROMBase; /* * Special purpose kernel virtual addresses, used for mapping * physical pages for a variety of temporary or permanent purposes: * * CADDR1, CADDR2: pmap zero/copy operations * vmmap: /dev/mem, crash dumps, parity error checking * msgbufaddr: kernel message buffer */ void *CADDR1, *CADDR2; char *vmmap; extern void *msgbufaddr; /* * Bootstrap the VM system. * * This is called with the MMU either on or off. If it's on, we assume * that it's mapped with the same PA <=> LA mapping that we eventually * want. The page sizes and the protections will be wrong, anyway. * * nextpa is the first address following the loaded kernel. */ paddr_t __attribute__((no_instrument_function)) pmap_bootstrap1(paddr_t nextpa, paddr_t firstpa) { paddr_t lwp0upa, kstpa, kptmpa, kptpa; u_int nptpages, kstsize; int i; st_entry_t protoste, *ste, *este; pt_entry_t protopte, *pte, *epte; u_int stfree = 0; /* XXX: gcc -Wuninitialized */ extern char start[]; nextpa = m68k_round_page(nextpa); /* * Calculate important physical addresses: * * lwp0upa lwp0 u-area UPAGES pages * * kstpa kernel segment table 1 page (!040) * N pages (040) * * kptmpa kernel PT map 1 page * * kptpa statically allocated * kernel PT pages Sysptsize+ pages * * [ Sysptsize is the number of pages of PT, and IIOMAPSIZE and * NBMAPSIZE are the number of PTEs, hence we need to round * the total to a page boundary with IO maps at the end. ] * */ kernel_reloc_offset = firstpa; lwp0upa = nextpa; nextpa += USPACE; if (mmutype == MMU_68040) kstsize = MAXKL2SIZE / (NPTEPG/SG4_LEV2SIZE); else kstsize = 1; kstpa = nextpa; nextpa += kstsize * PAGE_SIZE; kptmpa = nextpa; nextpa += PAGE_SIZE; kptpa = nextpa; nptpages = Sysptsize + (IIOMAPSIZE + ROMMAPSIZE + btoc(vidlen) + NPTEPG - 1) / NPTEPG; /* * New kmem arena is allocated prior to pmap_init(), so we need * additiona PT pages to account for that allocation, which is based * on physical memory size. Just sum up memory and add enough PT * pages for that size. */ nptpages += howmany(physmem, NPTEPG); nptpages++; nextpa += nptpages * PAGE_SIZE; pmap_machine_check_bootstrap_allocations(nextpa, firstpa); /* * Initialize segment table and kernel page table map. * * On 68030s and earlier MMUs the two are identical except for * the valid bits so both are initialized with essentially the * same values. On the 68040, which has a mandatory 3-level * structure, the segment table holds the level 1 table and part * (or all) of the level 2 table and hence is considerably * different. Here the first level consists of 128 descriptors * (512 bytes) each mapping 32mb of address space. Each of these * points to blocks of 128 second level descriptors (512 bytes) * each mapping 256kb. Note that there may be additional "segment * table" pages depending on how large MAXKL2SIZE is. * * Portions of the last segment of KVA space (0xFFC00000 - * 0xFFFFFFFF) are mapped for the kernel page tables. * * XXX cramming two levels of mapping into the single "segment" * table on the 68040 is intended as a temporary hack to get things * working. The 224mb of address space that this allows will most * likely be insufficient in the future (at least for the kernel). */ if (mmutype == MMU_68040) { int nl1desc, nl2desc; /* * First invalidate the entire "segment table" pages * (levels 1 and 2 have the same "invalid" value). */ ste = PA2VA(kstpa, st_entry_t *); este = &ste[kstsize * NPTEPG]; while (ste < este) *ste++ = SG_NV; /* * Initialize level 2 descriptors (which immediately * follow the level 1 table). We need: * NPTEPG / SG4_LEV3SIZE * level 2 descriptors to map each of the nptpages * pages of PTEs. Note that we set the "used" bit * now to save the HW the expense of doing it. */ nl2desc = nptpages * (NPTEPG / SG4_LEV3SIZE); ste = PA2VA(kstpa, st_entry_t *); ste = &ste[SG4_LEV1SIZE]; este = &ste[nl2desc]; protoste = kptpa | SG_U | SG_RW | SG_V; while (ste < este) { *ste++ = protoste; protoste += (SG4_LEV3SIZE * sizeof(st_entry_t)); } /* * Initialize level 1 descriptors. We need: * howmany(nl2desc, SG4_LEV2SIZE) * level 1 descriptors to map the `nl2desc' level 2's. */ nl1desc = howmany(nl2desc, SG4_LEV2SIZE); ste = PA2VA(kstpa, u_int *); este = &ste[nl1desc]; protoste = (paddr_t)&ste[SG4_LEV1SIZE] | SG_U | SG_RW | SG_V; while (ste < este) { *ste++ = protoste; protoste += (SG4_LEV2SIZE * sizeof(st_entry_t)); } /* * Initialize the final level 1 descriptor to map the next * block of level 2 descriptors for Sysptmap. */ ste = PA2VA(kstpa, st_entry_t *); ste = &ste[SG4_LEV1SIZE - 1]; *ste = protoste; /* * Now initialize the final portion of that block of * descriptors to map Sysmap. */ i = SG4_LEV1SIZE + (nl1desc * SG4_LEV2SIZE); ste = PA2VA(kstpa, st_entry_t *); ste = &ste[i + SG4_LEV2SIZE - (NPTEPG / SG4_LEV3SIZE)]; este = &ste[NPTEPG / SG4_LEV3SIZE]; protoste = kptmpa | SG_U | SG_RW | SG_V; while (ste < este) { *ste++ = protoste; protoste += (SG4_LEV3SIZE * sizeof(st_entry_t)); } /* * Calculate the free level 2 descriptor mask * noting that we have used: * 0: level 1 table * 1 to nl1desc: map page tables * nl1desc + 1: maps kptmpa and last-page page table */ /* mark an entry for level 1 table */ stfree = ~l2tobm(0); /* mark entries for map page tables */ for (i = 1; i <= nl1desc; i++) stfree &= ~l2tobm(i); /* mark an entry for kptmpa and lkptpa */ stfree &= ~l2tobm(i); /* mark entries not available */ for (i = MAXKL2SIZE; i < sizeof(stfree) * NBBY; i++) stfree &= ~l2tobm(i); /* * Initialize Sysptmap */ pte = PA2VA(kptmpa, pt_entry_t *); epte = &pte[nptpages]; protopte = kptpa | PG_RW | PG_CI | PG_V; while (pte < epte) { *pte++ = protopte; protopte += PAGE_SIZE; } /* * Invalidate all remaining entries. */ epte = PA2VA(kptmpa, pt_entry_t *); epte = &epte[TIB_SIZE]; while (pte < epte) { *pte++ = PG_NV; } /* * Initialize the last one to point to Sysptmap. */ pte = PA2VA(kptmpa, pt_entry_t *); pte = &pte[SYSMAP_VA >> SEGSHIFT]; *pte = kptmpa | PG_RW | PG_CI | PG_V; } else { /* * Map the page table pages in both the HW segment table * and the software Sysptmap. */ ste = PA2VA(kstpa, st_entry_t *); pte = PA2VA(kptmpa, pt_entry_t *); epte = &pte[nptpages]; protoste = kptpa | SG_RW | SG_V; protopte = kptpa | PG_RW | PG_CI | PG_V; while (pte < epte) { *ste++ = protoste; *pte++ = protopte; protoste += PAGE_SIZE; protopte += PAGE_SIZE; } /* * Invalidate all remaining entries in both. */ este = PA2VA(kstpa, st_entry_t *); este = &este[TIA_SIZE]; while (ste < este) *ste++ = SG_NV; epte = PA2VA(kptmpa, pt_entry_t *); epte = &epte[TIB_SIZE]; while (pte < epte) *pte++ = PG_NV; /* * Initialize the last one to point to Sysptmap. */ ste = PA2VA(kstpa, st_entry_t *); ste = &ste[SYSMAP_VA >> SEGSHIFT]; pte = PA2VA(kptmpa, pt_entry_t *); pte = &pte[SYSMAP_VA >> SEGSHIFT]; *ste = kptmpa | SG_RW | SG_V; *pte = kptmpa | PG_RW | PG_CI | PG_V; } /* * Initialize kernel page table. * Start by invalidating the `nptpages' that we have allocated. */ pte = PA2VA(kptpa, pt_entry_t *); epte = &pte[nptpages * NPTEPG]; while (pte < epte) *pte++ = PG_NV; /* * Validate PTEs for kernel text (RO). * Pages up to "start" (vectors and Mac OS global variable space) * must be writable for the ROM. */ pte = PA2VA(kptpa, pt_entry_t *); pte = &pte[m68k_btop(KERNBASE)]; epte = &pte[m68k_btop(m68k_round_page(start))]; protopte = firstpa | PG_RW | PG_V; while (pte < epte) { *pte++ = protopte; protopte += PAGE_SIZE; } epte = &pte[m68k_btop(m68k_trunc_page(&etext))]; protopte = (protopte & ~PG_PROT) | PG_RO; while (pte < epte) { *pte++ = protopte; protopte += PAGE_SIZE; } /* * Validate PTEs for kernel data/bss, dynamic data allocated * by us so far (kstpa - firstpa bytes), and pages for lwp0 * u-area and page table allocated below (RW). */ epte = PA2VA(kptpa, pt_entry_t *); epte = &epte[m68k_btop(kstpa - firstpa)]; protopte = (protopte & ~PG_PROT) | PG_RW; /* * Enable copy-back caching of data pages */ if (mmutype == MMU_68040) protopte |= PG_CCB; while (pte < epte) { *pte++ = protopte; protopte += PAGE_SIZE; } /* * Map the kernel segment table cache invalidated for 68040/68060. * (for the 68040 not strictly necessary, but recommended by Motorola; * for the 68060 mandatory) */ epte = PA2VA(kptpa, pt_entry_t *); epte = &epte[m68k_btop(nextpa - firstpa)]; protopte = (protopte & ~PG_PROT) | PG_RW; if (mmutype == MMU_68040) { protopte &= ~PG_CCB; protopte |= PG_CIN; } while (pte < epte) { *pte++ = protopte; protopte += PAGE_SIZE; } /* * Finally, validate the internal IO space PTEs (RW+CI). */ #define PTE2VA(pte) m68k_ptob(pte - PA2VA(kptpa, pt_entry_t *)) protopte = IOBase | PG_RW | PG_CI | PG_V; IOBase = PTE2VA(pte); epte = &pte[IIOMAPSIZE]; while (pte < epte) { *pte++ = protopte; protopte += PAGE_SIZE; } protopte = (pt_entry_t)ROMBase | PG_RO | PG_V; ROMBase = (void *)PTE2VA(pte); epte = &pte[ROMMAPSIZE]; while (pte < epte) { *pte++ = protopte; protopte += PAGE_SIZE; } if (vidlen) { protopte = m68k_trunc_page(mac68k_video.mv_phys) | PG_RW | PG_V | PG_CI; newvideoaddr = PTE2VA(pte) + m68k_page_offset(mac68k_video.mv_phys); epte = &pte[btoc(vidlen)]; while (pte < epte) { *pte++ = protopte; protopte += PAGE_SIZE; } } virtual_avail = PTE2VA(pte); /* * Calculate important exported kernel addresses and related values. */ /* * Sysseg: base of kernel segment table */ Sysseg = PA2VA(kstpa, st_entry_t *); Sysseg_pa = kstpa; #if defined(M68040) || defined(M68060) if (mmutype == MMU_68040) protostfree = stfree; #endif /* * Sysptmap: base of kernel page table map */ Sysptmap = PA2VA(kptmpa, pt_entry_t *); /* * Sysmap: kernel page table (as mapped through Sysptmap) * Allocated at the end of KVA space. */ Sysmap = (pt_entry_t *)SYSMAP_VA; /* * Remember the u-area address so it can be loaded in the lwp0 * via uvm_lwp_setuarea() later in pmap_bootstrap2(). */ lwp0uarea = PA2VA(lwp0upa, vaddr_t); virtual_end = VM_MAX_KERNEL_ADDRESS; /* * Allocate some fixed, special purpose kernel virtual addresses */ { vaddr_t va = virtual_avail; CADDR1 = (void *)va; va += PAGE_SIZE; CADDR2 = (void *)va; va += PAGE_SIZE; vmmap = (void *)va; va += PAGE_SIZE; msgbufaddr = (void *)va; va += m68k_round_page(MSGBUFSIZE); virtual_avail = va; } return nextpa; }
