diff options
Diffstat (limited to 'src/boot/hardwaremain.c')
| -rw-r--r-- | src/boot/hardwaremain.c | 86 |
1 files changed, 50 insertions, 36 deletions
diff --git a/src/boot/hardwaremain.c b/src/boot/hardwaremain.c index fed5302261..e3667cccd8 100644 --- a/src/boot/hardwaremain.c +++ b/src/boot/hardwaremain.c @@ -37,9 +37,6 @@ it with the version available from LANL. #include <device/pci.h> #include <device/chip.h> #include <delay.h> -#if 0 -#include <part/mainboard.h> -#endif #include <part/hard_reset.h> #include <smp/atomic.h> #include <boot/elf.h> @@ -81,6 +78,12 @@ static struct mem_range *get_ramsize(void) /* Number of cpus that are currently running in linuxbios */ static atomic_t active_cpus = ATOMIC_INIT(1); +/** + * @brief Initialize secondary processors. + * + * + * @todo move this into a method of per cpu data structure. + */ void secondary_cpu_init(void) { struct mem_range *mem; @@ -88,12 +91,14 @@ void secondary_cpu_init(void) int index; atomic_inc(&active_cpus); + printk_debug("%s\n", __FUNCTION__); mem = get_ramsize(); id = cpu_initialize(mem); index = processor_index(id); printk_debug("%s %d/%u\n", __FUNCTION__ , index, id); processor_map[index] = CPU_ENABLED; + atomic_dec(&active_cpus); stop_cpu(id); } @@ -105,20 +110,22 @@ static void wait_for_other_cpus(void) old_active_count = 1; active_count = atomic_read(&active_cpus); - while(active_count > 1) { + while (active_count > 1) { if (active_count != old_active_count) { - printk_info("Waiting for %d CPUS to stop\n", active_count); + printk_info("Waiting for %d CPUS to stop\n", + active_count); old_active_count = active_count; } active_count = atomic_read(&active_cpus); } - for(i = 0; i < CONFIG_MAX_CPUS; i++) { + + for (i = 0; i < CONFIG_MAX_CPUS; i++) { if (!(processor_map[i] & CPU_ENABLED)) { printk_err("CPU %d did not initialize!\n", i); processor_map[i] = 0; -#warning "FIXME do I need a mainboard_cpu_fixup function?" } } + printk_debug("All AP CPUs stopped\n"); } @@ -126,20 +133,16 @@ static void wait_for_other_cpus(void) #define wait_for_other_cpus() do {} while(0) #endif /* CONFIG_SMP */ +/** + * @brief Main program of LinuxBIOS + * + * @param boot_complete + */ void hardwaremain(int boot_complete) { /* Processor ID of the BOOT cpu (i.e. the one running this code) */ unsigned long boot_cpu; int boot_index; - - /* the order here is a bit tricky. We don't want to do much of - * anything that uses config registers until after PciAllocateResources - * since that function also figures out what kind of config strategy - * to use (type 1 or type 2). - * so we turn on cache, then worry about PCI setup, then do other - * things, so that the other work can use the PciRead* and PciWrite* - * functions. - */ struct mem_range *mem, *tmem; struct lb_memory *lb_mem; unsigned long totalmem; @@ -153,8 +156,8 @@ void hardwaremain(int boot_complete) post_code(0x39); printk_notice("LinuxBIOS-%s%s %s %s...\n", - linuxbios_version, linuxbios_extra_version, linuxbios_build, - (boot_complete)?"rebooting":"booting"); + linuxbios_version, linuxbios_extra_version, + linuxbios_build, (boot_complete)?"rebooting":"booting"); post_code(0x40); @@ -162,57 +165,68 @@ void hardwaremain(int boot_complete) if (boot_complete) { hard_reset(); } + CONFIGURE(CONF_PASS_PRE_PCI); - /* pick how to scan the bus. This is first so we can get at memory size. */ + /* determine how software can generate PCI configuration transactions + * in this system */ printk_info("Finding PCI configuration type.\n"); pci_set_method(); post_code(0x5f); + + /* convert static device structures into dynamic device structures + * before probing dynamic devices. */ enumerate_static_devices(); + + /* probe the existence of dynamic devices and construct the dynamic + * device tree. */ dev_enumerate(); post_code(0x66); - /* Now do the real bus. - * We round the total ram up a lot for thing like the SISFB, which - * shares high memory with the CPU. - */ + + /* probe and assign the resources required by the dynamic devices */ dev_configure(); post_code(0x88); + /* enable the resources probed and assigned in dev_configure() */ dev_enable(); + /* do the device specific init in additional to simple resources + * allocation performed in dev_enable() */ dev_initialize(); post_code(0x89); CONFIGURE(CONF_PASS_POST_PCI); + /* this is done last because some devices may 'steal' memory from + * the system during device initialization. */ mem = get_ramsize(); post_code(0x70); - totalmem = 0; - for(tmem = mem; tmem->sizek; tmem++) { + for (totalmem = 0, tmem = mem; tmem->sizek; tmem++) { totalmem += tmem->sizek; } - printk_info("totalram: %ldM\n", - (totalmem + 512) >> 10); /* Round to the nearest meg */ + /* Round to the nearest mega */ + printk_info("totalram: %ldM\n", (totalmem + 512) >> 10); - /* Fully initialize the cpu before configuring the bus */ + /* fully initialize the boot processor */ boot_cpu = cpu_initialize(mem); boot_index = processor_index(boot_cpu); printk_spew("BOOT CPU is %d\n", boot_cpu); processor_map[boot_index] = CPU_BOOTPROCESSOR|CPU_ENABLED; - /* Now start the other cpus initializing - * The sooner they start the sooner they stop. - */ + /* start up other processors, it works like a pthread_create() or + * fork(), instead of running the initialization code for all devices + * as the boot processor, they start from secondary_cpu_init(), doing + * cpu initialization only. */ post_code(0x75); startup_other_cpus(processor_map); - post_code(0x77); - /* make certain we are the only cpu running in linuxBIOS */ + /* like pthread_join() or wait(), wait other processors finishing + * their execution of secondary_cpu_init() and make certain we are + * the only cpu running in LinuxBIOS */ wait_for_other_cpus(); - /* Now that we have collected all of our information - * write our configuration tables. - */ + /* Now that we have collected all of our information, write our + * configuration tables. */ lb_mem = write_tables(mem, processor_map); CONFIGURE(CONF_PASS_PRE_BOOT); |