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hw: determine CPU count on x86

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Issue #2929
This commit is contained in:
Alexander Boettcher 2018-08-01 14:07:44 +02:00 committed by Christian Helmuth
parent bf340eee91
commit f0f473392d
1 changed files with 59 additions and 11 deletions
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70
repos/base-hw/src/bootstrap/spec/x86_64/platform.cc
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@ -18,6 +18,8 @@
#include <multiboot.h>
#include <multiboot2.h>
#include <hw/spec/x86_64/acpi.h>
using namespace Genode;
/* contains Multiboot MAGIC value (either version 1 or 2) */
@ -83,25 +85,71 @@ Bootstrap::Platform::Board::Board()
[&] (Hw::Framebuffer const &fb) {
framebuffer = fb;
});
} else if (__initial_ax == Multiboot_info::MAGIC) {
for (unsigned i = 0; true; i++) {
using Mmap = Multiboot_info::Mmap;
return;
}
Mmap v(Multiboot_info(__initial_bx).phys_ram_mmap_base(i));
if (!v.base()) break;
if (__initial_ax != Multiboot_info::MAGIC) {
Mmap::Addr::access_t base = v.read<Mmap::Addr>();
Mmap::Length::access_t size = v.read<Mmap::Length>();
lambda(base, size);
}
} else {
error("invalid multiboot magic value: ", Hex(__initial_ax));
return;
}
for (unsigned i = 0; true; i++) {
using Mmap = Multiboot_info::Mmap;
if (!acpi_rsdp.valid())
return;
Mmap v(Multiboot_info(__initial_bx).phys_ram_mmap_base(i));
if (!v.base()) break;
uint64_t const table_addr = acpi_rsdp.xsdt ? acpi_rsdp.xsdt : acpi_rsdp.rsdt;
Mmap::Addr::access_t base = v.read<Mmap::Addr>();
Mmap::Length::access_t size = v.read<Mmap::Length>();
if (!table_addr)
return;
lambda(base, size);
/* find out the number of available CPUs */
unsigned const max_cpus = cpus;
cpus = 0;
Hw::Acpi_generic * table = reinterpret_cast<Hw::Acpi_generic *>(table_addr);
if (!memcmp(table->signature, "RSDT", 4)) {
Hw::for_each_rsdt_entry(*table, [&](uint32_t paddr_table) {
addr_t const table_virt_addr = paddr_table;
Hw::Acpi_generic * table = reinterpret_cast<Hw::Acpi_generic *>(table_virt_addr);
if (memcmp(table->signature, "APIC", 4))
return;
Hw::for_each_apic_struct(*table,[&](Hw::Apic_madt const *e){
if (e->type == Hw::Apic_madt::LAPIC) {
Hw::Apic_madt::Lapic lapic(e);
cpus ++;
}
});
});
} else if (!memcmp(table->signature, "XSDT", 4)) {
Hw::for_each_xsdt_entry(*table, [&](uint64_t paddr_table) {
addr_t const table_virt_addr = paddr_table;
Hw::Acpi_generic * table = reinterpret_cast<Hw::Acpi_generic *>(table_virt_addr);
if (memcmp(table->signature, "APIC", 4))
return;
Hw::for_each_apic_struct(*table,[&](Hw::Apic_madt const *e){
if (e->type == Hw::Apic_madt::LAPIC) {
Hw::Apic_madt::Lapic lapic(e);
cpus ++;
}
});
});
} else
Genode::error("unknown table signature");
if (!cpus || cpus > max_cpus) {
Genode::warning("CPU count is unsupported ", cpus, "/", max_cpus);
cpus = max_cpus;
}
}