/[pupa]/pupa/kern/i386/pc/init.c
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Diff of /pupa/kern/i386/pc/init.c

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revision 1.3 by okuji, Mon Jan 6 00:01:35 2003 UTC revision 1.4 by okuji, Fri Jan 17 02:52:05 2003 UTC
# Line 28  Line 28 
28  #include <pupa/err.h>  #include <pupa/err.h>
29  #include <pupa/dl.h>  #include <pupa/dl.h>
30  #include <pupa/misc.h>  #include <pupa/misc.h>
31    #include <pupa/loader.h>
32    
33    struct mem_region
34    {
35      pupa_addr_t addr;
36      pupa_size_t size;
37    };
38    
39    #define MAX_REGIONS     32
40    
41    static struct mem_region mem_regions[MAX_REGIONS];
42    static int num_regions;
43    
44    pupa_addr_t pupa_os_area_addr;
45    pupa_size_t pupa_os_area_size;
46    pupa_size_t pupa_lower_mem, pupa_upper_mem;
47    
48  static char *  static char *
49  make_install_device (void)  make_install_device (void)
# Line 51  make_install_device (void) Line 67  make_install_device (void)
67    return pupa_prefix;    return pupa_prefix;
68  }  }
69    
70    /* Add a memory region.  */
71    static void
72    add_mem_region (pupa_addr_t addr, pupa_size_t size)
73    {
74      if (num_regions == MAX_REGIONS)
75        /* Ignore.  */
76        return;
77    
78      mem_regions[num_regions].addr = addr;
79      mem_regions[num_regions].size = size;
80      num_regions++;
81    }
82    
83    /* Compact memory regions.  */
84    static void
85    compact_mem_regions (void)
86    {
87      int i, j;
88    
89      /* Sort them.  */
90      for (i = 0; i < num_regions - 1; i++)
91        for (j = i + 1; j < num_regions; j++)
92          if (mem_regions[i].addr > mem_regions[j].addr)
93            {
94              struct mem_region tmp = mem_regions[i];
95              mem_regions[i] = mem_regions[j];
96              mem_regions[j] = tmp;
97            }
98    
99      /* Merge overlaps.  */
100      for (i = 0; i < num_regions - 1; i++)
101        if (mem_regions[i].addr + mem_regions[i].size >= mem_regions[i + 1].addr)
102          {
103            j = i + 1;
104            
105            if (mem_regions[i].addr + mem_regions[i].size
106                < mem_regions[j].addr + mem_regions[j].size)
107              mem_regions[i].size = (mem_regions[j].addr + mem_regions[j].size
108                                     - mem_regions[i].addr);
109    
110            pupa_memmove (mem_regions + j, mem_regions + j + 1,
111                          (num_regions - j - 1) * sizeof (struct mem_region));
112            i--;
113          }
114    }
115    
116  void  void
117  pupa_machine_init (void)  pupa_machine_init (void)
118  {  {
119    pupa_uint32_t cont;    pupa_uint32_t cont;
120    struct pupa_machine_mmap_entry *entry    struct pupa_machine_mmap_entry *entry
121      = (struct pupa_machine_mmap_entry *) PUPA_MEMORY_MACHINE_SCRATCH_ADDR;      = (struct pupa_machine_mmap_entry *) PUPA_MEMORY_MACHINE_SCRATCH_ADDR;
   pupa_size_t lower_mem = (pupa_get_memsize (0) << 10);  
122    pupa_addr_t end_addr = pupa_get_end_addr ();    pupa_addr_t end_addr = pupa_get_end_addr ();
123      int i;
124      
125    /* Initialize the console as early as possible.  */    /* Initialize the console as early as possible.  */
126    pupa_console_init ();    pupa_console_init ();
127        
128      pupa_lower_mem = pupa_get_memsize (0) << 10;
129      
130    /* Sanity check.  */    /* Sanity check.  */
131    if (lower_mem < PUPA_MEMORY_MACHINE_RESERVED_END)    if (pupa_lower_mem < PUPA_MEMORY_MACHINE_RESERVED_END)
132      pupa_fatal ("too small memory");      pupa_fatal ("too small memory");
133        
134    /* Turn on Gate A20 to access >1MB.  */    /* Turn on Gate A20 to access >1MB.  */
135    pupa_gate_a20 (1);    pupa_gate_a20 (1);
136    
137    /* Add the lower memory into free memory.  */    /* Add the lower memory into free memory.  */
138    if (lower_mem >= PUPA_MEMORY_MACHINE_RESERVED_END)    if (pupa_lower_mem >= PUPA_MEMORY_MACHINE_RESERVED_END)
139      pupa_mm_init_region ((void *) PUPA_MEMORY_MACHINE_RESERVED_END,      add_mem_region (PUPA_MEMORY_MACHINE_RESERVED_END,
140                           lower_mem - PUPA_MEMORY_MACHINE_RESERVED_END);                      pupa_lower_mem - PUPA_MEMORY_MACHINE_RESERVED_END);
141        
142    pupa_mm_init_region ((void *) end_addr,    add_mem_region (end_addr, PUPA_MEMORY_MACHINE_RESERVED_START - end_addr);
                        PUPA_MEMORY_MACHINE_RESERVED_START - end_addr);  
143    
144    /* Check if pupa_get_mmap_entry works.  */    /* Check if pupa_get_mmap_entry works.  */
145    cont = pupa_get_mmap_entry (entry, 0);    cont = pupa_get_mmap_entry (entry, 0);
# Line 104  pupa_machine_init (void) Line 167  pupa_machine_init (void)
167              len = ((addr + entry->len > 0xFFFFFFFF)              len = ((addr + entry->len > 0xFFFFFFFF)
168                     ? 0xFFFFFFFF - addr                     ? 0xFFFFFFFF - addr
169                     : (pupa_size_t) entry->len);                     : (pupa_size_t) entry->len);
170              pupa_mm_init_region ((void *) addr, len);              add_mem_region (addr, len);
171            }            }
172                    
173        next:        next:
# Line 121  pupa_machine_init (void) Line 184  pupa_machine_init (void)
184        if (eisa_mmap)        if (eisa_mmap)
185          {          {
186            if ((eisa_mmap & 0xFFFF) == 0x3C00)            if ((eisa_mmap & 0xFFFF) == 0x3C00)
187              pupa_mm_init_region ((void *) 0x100000,              add_mem_region (0x100000, (eisa_mmap << 16) + 0x100000 * 15);
                                  (eisa_mmap << 16) + 0x100000 * 15);  
188            else            else
189              {              {
190                pupa_mm_init_region ((void *) 0x100000,                add_mem_region (0x100000, (eisa_mmap & 0xFFFF) << 10);
191                                     (eisa_mmap & 0xFFFF) << 10);                add_mem_region (0x1000000, eisa_mmap << 16);
               pupa_mm_init_region ((void *) 0x1000000, eisa_mmap << 16);  
192              }              }
193          }          }
194        else        else
195          pupa_mm_init_region ((void *) 0x100000,          add_mem_region (0x100000, pupa_get_memsize (1) << 10);
                              (pupa_size_t) pupa_get_memsize (1) << 10);  
196      }      }
197    
198      compact_mem_regions ();
199    
200      /* Add the memory regions to free memory, except for the region starting
201         from 1MB. This region is partially used for loading OS images.
202         For now, 1/4 of this is added to free memory.  */
203      for (i = 0; i < num_regions; i++)
204        if (mem_regions[i].addr == 0x100000)
205          {
206            pupa_size_t quarter = mem_regions[i].size >> 2;
207    
208            pupa_upper_mem = mem_regions[i].size;
209            pupa_os_area_addr = mem_regions[i].addr;
210            pupa_os_area_size = mem_regions[i].size - quarter;
211            pupa_mm_init_region ((void *) (pupa_os_area_addr + pupa_os_area_size),
212                                 quarter);
213          }
214        else
215          pupa_mm_init_region ((void *) mem_regions[i].addr, mem_regions[i].size);
216      
217      if (! pupa_os_area_addr)
218        pupa_fatal ("no upper memory");
219      
220    /* The memory system was initialized, thus register built-in devices.  */    /* The memory system was initialized, thus register built-in devices.  */
221    pupa_biosdisk_init ();    pupa_biosdisk_init ();
222    

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