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>
38 #include <device/chip.h>
41 #include <part/mainboard.h>
43 #include <part/hard_reset.h>
44 #include <smp/atomic.h>
48 #ifndef CONFIG_MAX_PHYSICAL_CPUS
49 #define CONFIG_MAX_PHYSICAL_CPUS CONFIG_MAX_CPUS
53 * Now that SMP is in linuxbios, and Linux counts on us
54 * giving accurate information about processors, we need a map
55 * of what processors are out there. This could be a bit mask,
56 * but we will be optimistic and hope we someday run on
57 * REALLY BIG SMPs. Also we may need more than one bit of
58 * info per processor at some point. I hope we don't need
59 * anything more complex than an int.
61 static unsigned long processor_map[CONFIG_MAX_CPUS];
63 static struct mem_range *get_ramsize(void)
65 struct mem_range *mem = 0;
70 printk_emerg("No memory size information!\n");
72 /* Ensure this loop is not optimized away */
73 asm volatile("":/* outputs */:/*inputs */ :"memory");
81 /* Number of cpus that are currently running in linuxbios */
82 static atomic_t active_cpus = ATOMIC_INIT(1);
84 void secondary_cpu_init(void)
86 struct mem_range *mem;
90 atomic_inc(&active_cpus);
91 printk_debug(__FUNCTION__ "\n");
93 id = cpu_initialize(mem);
94 index = processor_index(id);
95 printk_debug(__FUNCTION__ " %d/%u\n", index, id);
96 processor_map[index] = CPU_ENABLED;
97 atomic_dec(&active_cpus);
101 static void wait_for_other_cpus(void)
103 int old_active_count, active_count;
105 old_active_count = 1;
107 active_count = atomic_read(&active_cpus);
108 while(active_count > 1) {
109 if (active_count != old_active_count) {
110 printk_info("Waiting for %d CPUS to stop\n", active_count);
111 old_active_count = active_count;
113 active_count = atomic_read(&active_cpus);
115 for(i = 0; i < CONFIG_MAX_CPUS; i++) {
116 if (!(processor_map[i] & CPU_ENABLED)) {
117 printk_err("CPU %d did not initialize!\n", i);
118 processor_map[i] = 0;
119 #warning "FIXME do I need a mainboard_cpu_fixup function?"
122 printk_debug("All AP CPUs stopped\n");
125 #else /* CONIFG_SMP */
126 #define wait_for_other_cpus() do {} while(0)
127 #endif /* CONFIG_SMP */
129 void hardwaremain(int boot_complete)
131 /* Processor ID of the BOOT cpu (i.e. the one running this code) */
132 unsigned long boot_cpu;
135 /* the order here is a bit tricky. We don't want to do much of
136 * anything that uses config registers until after PciAllocateResources
137 * since that function also figures out what kind of config strategy
138 * to use (type 1 or type 2).
139 * so we turn on cache, then worry about PCI setup, then do other
140 * things, so that the other work can use the PciRead* and PciWrite*
143 struct mem_range *mem, *tmem;
144 struct lb_memory *lb_mem;
145 unsigned long totalmem;
149 CONFIGURE(CONF_PASS_PRE_CONSOLE);
151 /* displayinit MUST PRECEDE ALL PRINTK! */
155 printk_notice("LinuxBIOS-%s%s %s %s...\n",
156 linuxbios_version, linuxbios_extra_version, linuxbios_build,
157 (boot_complete)?"rebooting":"booting");
161 /* If we have already booted attempt a hard reboot */
165 init_timer(); /* needs to be moved into static configuration */
166 CONFIGURE(CONF_PASS_PRE_PCI);
168 /* pick how to scan the bus. This is first so we can get at memory size. */
169 printk_info("Finding PCI configuration type.\n");
172 enumerate_static_devices();
175 /* Now do the real bus.
176 * We round the total ram up a lot for thing like the SISFB, which
177 * shares high memory with the CPU.
187 CONFIGURE(CONF_PASS_POST_PCI);
192 for(tmem = mem; tmem->sizek; tmem++) {
193 totalmem += tmem->sizek;
195 printk_info("totalram: %ldM\n",
196 (totalmem + 512) >> 10); /* Round to the nearest meg */
198 /* Fully initialize the cpu before configuring the bus */
199 boot_cpu = cpu_initialize(mem);
200 boot_index = processor_index(boot_cpu);
201 printk_spew("BOOT CPU is %d\n", boot_cpu);
202 processor_map[boot_index] = CPU_BOOTPROCESSOR|CPU_ENABLED;
204 /* Now start the other cpus initializing
205 * The sooner they start the sooner they stop.
208 startup_other_cpus(processor_map);
211 /* make certain we are the only cpu running in linuxBIOS */
212 wait_for_other_cpus();
214 /* Now that we have collected all of our information
215 * write our configuration tables.
217 lb_mem = write_tables(mem, processor_map);
219 CONFIGURE(CONF_PASS_PRE_BOOT);