Initial revision

kern/i386/dl.c

@@ -0,0 +1,126 @@
+/* dl-386.c - arch-dependent part of loadable module support */
+/*
+ *  PUPA  --  Preliminary Universal Programming Architecture for GRUB
+ *  Copyright (C) 2002 Yoshinori K. Okuji <okuji@enbug.org>
+ *
+ *  PUPA is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with PUPA; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <pupa/dl.h>
+#include <pupa/elf.h>
+#include <pupa/misc.h>
+#include <pupa/err.h>
+
+/* Check if EHDR is a valid ELF header.  */
+int
+pupa_arch_dl_check_header (void *ehdr, unsigned size)
+{
+  Elf32_Ehdr *e = ehdr;
+
+  /* Check the header size.  */
+  if (size < sizeof (Elf32_Ehdr))
+    return 0;
+
+  /* Check the magic numbers.  */
+  if (e->e_ident[EI_MAG0] != ELFMAG0
+      || e->e_ident[EI_MAG1] != ELFMAG1
+      || e->e_ident[EI_MAG2] != ELFMAG2
+      || e->e_ident[EI_MAG3] != ELFMAG3
+      || e->e_version != EV_CURRENT
+      || e->e_ident[EI_CLASS] != ELFCLASS32
+      || e->e_ident[EI_DATA] != ELFDATA2LSB
+      || e->e_machine != EM_386
+      || e->e_type != ET_REL)
+    return 0;
+
+  /* Make sure that every section is within the core.  */
+  if (size < e->e_shoff + e->e_shentsize * e->e_shnum)
+    return 0;
+
+  return 1;
+}
+
+/* Relocate symbols.  */
+pupa_err_t
+pupa_arch_dl_relocate_symbols (pupa_dl_t mod, void *ehdr)
+{
+  Elf32_Ehdr *e = ehdr;
+  Elf32_Shdr *s;
+  Elf32_Sym *symtab;
+  Elf32_Word entsize;
+  unsigned i;
+
+  /* Find a symbol table.  */
+  for (i = 0, s = (Elf32_Shdr *) ((char *) e + e->e_shoff);
+       i < e->e_shnum;
+       i++, s = (Elf32_Shdr *) ((char *) s + e->e_shentsize))
+    if (s->sh_type == SHT_SYMTAB)
+      break;
+
+  if (i == e->e_shnum)
+    return pupa_error (PUPA_ERR_BAD_MODULE, "no symtab found");
+  
+  symtab = (Elf32_Sym *) ((char *) e + s->sh_offset);
+  entsize = s->sh_entsize;
+
+  for (i = 0, s = (Elf32_Shdr *) ((char *) e + e->e_shoff);
+       i < e->e_shnum;
+       i++, s = (Elf32_Shdr *) ((char *) s + e->e_shentsize))
+    if (s->sh_type == SHT_REL)
+      {
+	pupa_dl_segment_t seg;
+
+	/* Find the target segment.  */
+	for (seg = mod->segment; seg; seg = seg->next)
+	  if (seg->section == s->sh_info)
+	    break;
+
+	if (seg)
+	  {
+	    Elf32_Rel *rel, *max;
+	    
+	    for (rel = (Elf32_Rel *) ((char *) e + s->sh_offset),
+		   max = rel + s->sh_size / s->sh_entsize;
+		 rel < max;
+		 rel++)
+	      {
+		Elf32_Word *addr;
+		Elf32_Sym *sym;
+		
+		if (seg->size < rel->r_offset)
+		  return pupa_error (PUPA_ERR_BAD_MODULE,
+				     "reloc offset is out of the segment");
+		
+		addr = (Elf32_Word *) ((char *) seg->addr + rel->r_offset);
+		sym = (Elf32_Sym *) ((char *) symtab
+				     + entsize * ELF32_R_SYM (rel->r_info));
+		
+		switch (ELF32_R_TYPE (rel->r_info))
+		  {
+		  case R_386_32:
+		    *addr += sym->st_value;
+		    break;
+
+		  case R_386_PC32:
+		    *addr += (sym->st_value - (Elf32_Word) seg->addr
+			      - rel->r_offset);
+		    break;
+		  }
+	      }
+	  }
+      }
+
+  return PUPA_ERR_NONE;
+}

kern/i386/pc/init.c

@@ -0,0 +1,114 @@
+/*
+ *  PUPA  --  Preliminary Universal Programming Architecture for GRUB
+ *  Copyright (C) 2002  Yoshinori K. Okuji <okuji@enbug.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <pupa/kernel.h>
+#include <pupa/mm.h>
+#include <pupa/machine/init.h>
+#include <pupa/machine/memory.h>
+#include <pupa/machine/console.h>
+#include <pupa/machine/biosdisk.h>
+#include <pupa/types.h>
+#include <pupa/err.h>
+
+void
+pupa_machine_init (void)
+{
+  pupa_uint32_t cont;
+  struct pupa_machine_mmap_entry entry;
+  pupa_size_t lower_mem = (pupa_get_memsize (0) << 10);
+  pupa_addr_t end_addr = pupa_get_end_addr ();
+
+  /* Initialize the console as early as possible.  */
+  pupa_console_init ();
+  
+  /* Sanity check.  */
+  if (lower_mem < PUPA_MEMORY_MACHINE_RESERVED_END)
+    pupa_fatal ("too small memory");
+  
+  /* Turn on Gate A20 to access >1MB.  */
+  pupa_gate_a20 (1);
+
+  /* Add the lower memory into free memory.  */
+  if (lower_mem >= PUPA_MEMORY_MACHINE_RESERVED_END)
+    pupa_mm_init_region ((void *) PUPA_MEMORY_MACHINE_RESERVED_END,
+			 lower_mem - PUPA_MEMORY_MACHINE_RESERVED_END);
+  
+  pupa_mm_init_region ((void *) end_addr,
+		       PUPA_MEMORY_MACHINE_RESERVED_START - end_addr);
+
+  /* Check if pupa_get_mmap_entry works.  */
+  cont = pupa_get_mmap_entry (&entry, 0);
+
+  if (entry.size)
+    do
+      {
+	/* Avoid the lower memory.  */
+	if (entry.addr < 0x100000)
+	  {
+	    if (entry.len <= 0x100000 - entry.addr)
+	      goto next;
+
+	    entry.len -= 0x100000 - entry.addr;
+	    entry.addr = 0x100000;
+	  }
+	
+	/* Ignore >4GB.  */
+	if (entry.addr <= 0xFFFFFFFF && entry.type == 1)
+	  {
+	    pupa_addr_t addr;
+	    pupa_size_t len;
+
+	    addr = (pupa_addr_t) entry.addr;
+	    len = ((addr + entry.len > 0xFFFFFFFF)
+		   ? 0xFFFFFFFF - addr
+		   : (pupa_size_t) entry.len);
+	    pupa_mm_init_region ((void *) addr, len);
+	  }
+	
+      next:
+	if (! cont)
+	  break;
+	
+	cont = pupa_get_mmap_entry (&entry, cont);
+      }
+    while (entry.size);
+  else
+    {
+      pupa_uint32_t eisa_mmap = pupa_get_eisa_mmap ();
+
+      if (eisa_mmap)
+	{
+	  if ((eisa_mmap & 0xFFFF) == 0x3C00)
+	    pupa_mm_init_region ((void *) 0x100000,
+				 (eisa_mmap << 16) + 0x100000 * 15);
+	  else
+	    {
+	      pupa_mm_init_region ((void *) 0x100000,
+				   (eisa_mmap & 0xFFFF) << 10);
+	      pupa_mm_init_region ((void *) 0x1000000, eisa_mmap << 16);
+	    }
+	}
+      else
+	pupa_mm_init_region ((void *) 0x100000,
+			     (pupa_size_t) pupa_get_memsize (1) << 10);
+    }
+
+  /* The memory system was initialized, thus register built-in devices.  */
+  pupa_biosdisk_init ();
+}