2 This software and ancillary information (herein called SOFTWARE )
3 called LinuxBIOS is made available under the terms described
4 here. The SOFTWARE has been approved for release with associated
5 LA-CC Number 00-34 . Unless otherwise indicated, this SOFTWARE has
6 been authored by an employee or employees of the University of
7 California, operator of the Los Alamos National Laboratory under
8 Contract No. W-7405-ENG-36 with the U.S. Department of Energy. The
9 U.S. Government has rights to use, reproduce, and distribute this
10 SOFTWARE. The public may copy, distribute, prepare derivative works
11 and publicly display this SOFTWARE without charge, provided that this
12 Notice and any statement of authorship are reproduced on all copies.
13 Neither the Government nor the University makes any warranty, express
14 or implied, or assumes any liability or responsibility for the use of
15 this SOFTWARE. If SOFTWARE is modified to produce derivative works,
16 such modified SOFTWARE should be clearly marked, so as not to confuse
17 it with the version available from LANL.
19 /* Copyright 2000, Ron Minnich, Advanced Computing Lab, LANL
25 * C Bootstrap code for the LinuxBIOS
29 #include <console/console.h>
33 #include <smp/start_stop.h>
34 #include <boot/tables.h>
35 #include <part/sizeram.h>
36 #include <device/device.h>
37 #include <device/pci.h>
40 #include <part/mainboard.h>
43 #include <part/hard_reset.h>
45 #include <smp/atomic.h>
49 #ifndef CONFIG_MAX_PHYSICAL_CPUS
50 #define CONFIG_MAX_PHYSICAL_CPUS CONFIG_MAX_CPUS
54 * Now that SMP is in linuxbios, and Linux counts on us
55 * giving accurate information about processors, we need a map
56 * of what processors are out there. This could be a bit mask,
57 * but we will be optimistic and hope we someday run on
58 * REALLY BIG SMPs. Also we may need more than one bit of
59 * info per processor at some point. I hope we don't need
60 * anything more complex than an int.
62 static unsigned long processor_map[MAX_CPUS];
64 static struct mem_range *get_ramsize(void)
66 struct mem_range *mem = 0;
71 printk_emerg("No memory size information!\n");
73 /* Ensure this loop is not optimized away */
74 asm volatile("":/* outputs */:/*inputs */ :"memory");
82 /* Number of cpus that are currently running in linuxbios */
83 static atomic_t active_cpus = ATOMIC_INIT(1);
85 void secondary_cpu_init(void)
87 struct mem_range *mem;
91 atomic_inc(&active_cpus);
92 printk_debug(__FUNCTION__ "\n");
94 id = cpu_initialize(mem);
95 index = processor_index(id);
96 printk_debug(__FUNCTION__ " %d/%u\n", index, id);
97 processor_map[index] = CPU_ENABLED;
98 atomic_dec(&active_cpus);
102 static void wait_for_other_cpus(void)
104 int old_active_count, active_count;
106 old_active_count = 1;
108 active_count = atomic_read(&active_cpus);
109 while(active_count > 1) {
110 if (active_count != old_active_count) {
111 printk_info("Waiting for %d CPUS to stop\n", active_count);
112 old_active_count = active_count;
114 active_count = atomic_read(&active_cpus);
116 for(i = 0; i < MAX_CPUS; i++) {
117 if (!(processor_map[i] & CPU_ENABLED)) {
118 printk_err("CPU %d did not initialize!\n", i);
119 processor_map[i] = 0;
120 #warning "FIXME do I need a mainboard_cpu_fixup function?"
123 printk_debug("All AP CPUs stopped\n");
126 #else /* CONIFG_SMP */
127 #define wait_for_other_cpus() do {} while(0)
128 #endif /* CONFIG_SMP */
130 void hardwaremain(int boot_complete)
132 /* Processor ID of the BOOT cpu (i.e. the one running this code) */
133 unsigned long boot_cpu;
136 /* the order here is a bit tricky. We don't want to do much of
137 * anything that uses config registers until after PciAllocateResources
138 * since that function also figures out what kind of config strategy
139 * to use (type 1 or type 2).
140 * so we turn on cache, then worry about PCI setup, then do other
141 * things, so that the other work can use the PciRead* and PciWrite*
144 struct mem_range *mem, *tmem;
145 struct lb_memory *lb_mem;
146 unsigned long totalmem;
149 /* displayinit MUST PRECEDE ALL PRINTK! */
153 printk_notice("LinuxBIOS-%s%s %s %s...\n",
154 linuxbios_version, linuxbios_extra_version, linuxbios_build,
155 (boot_complete)?"rebooting":"booting");
160 /* If we have already booted attempt a hard reboot */
167 /* pick how to scan the bus. This is first so we can get at memory size. */
168 printk_info("Finding PCI configuration type.\n");
172 enumerate_static_devices();
176 /* Now do the real bus.
177 * We round the total ram up a lot for thing like the SISFB, which
178 * shares high memory with the CPU.
191 for(tmem = mem; tmem->sizek; tmem++) {
192 totalmem += tmem->sizek;
194 printk_info("totalram: %ldM\n",
195 (totalmem + 512) >> 10); /* Round to the nearest meg */
197 /* Fully initialize the cpu before configuring the bus */
198 boot_cpu = cpu_initialize(mem);
199 boot_index = processor_index(boot_cpu);
200 printk_spew("BOOT CPU is %d\n", boot_cpu);
201 processor_map[boot_index] = CPU_BOOTPROCESSOR|CPU_ENABLED;
203 /* Now start the other cpus initializing
204 * The sooner they start the sooner they stop.
207 startup_other_cpus(processor_map);
210 /* make certain we are the only cpu running in linuxBIOS */
211 wait_for_other_cpus();
213 /* Now that we have collected all of our information
214 * write our configuration tables.
216 lb_mem = write_tables(mem, processor_map);