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/*
* Copyright (c) 2021, Nico Weber <thakis@chromium.org>
* Copyright (c) 2021, Marcin Undak <mcinek@gmail.com>
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Format.h>
#include <AK/Types.h>
#include <Kernel/Arch/Processor.h>
#include <Kernel/Arch/aarch64/BootPPMParser.h>
#include <Kernel/Arch/aarch64/Prekernel/Prekernel.h>
#include <Kernel/Arch/aarch64/RPi/Framebuffer.h>
#include <Kernel/Arch/aarch64/RPi/Mailbox.h>
#include <Kernel/Arch/aarch64/RPi/Timer.h>
#include <Kernel/Arch/aarch64/RPi/UART.h>
#include <Kernel/KSyms.h>
#include <Kernel/Panic.h>
static void draw_logo();
static u32 query_firmware_version();
extern "C" void wait_cycles(int n);
struct TrapFrame {
u64 x[31]; // Saved general purpose registers
u64 spsr_el1; // Save Processor Status Register, EL1
u64 elr_el1; // Exception Link Reigster, EL1
u64 tpidr_el1; // EL0 thread ID
u64 sp_el0; // EL0 stack pointer
};
extern "C" [[noreturn]] void halt();
extern "C" [[noreturn]] void init();
extern "C" void exception_common(TrapFrame const* const trap_frame);
typedef void (*ctor_func_t)();
extern ctor_func_t start_heap_ctors[];
extern ctor_func_t end_heap_ctors[];
extern ctor_func_t start_ctors[];
extern ctor_func_t end_ctors[];
ALWAYS_INLINE static Kernel::Processor& bootstrap_processor()
{
alignas(Kernel::Processor) static u8 bootstrap_processor_storage[sizeof(Kernel::Processor)];
return (Kernel::Processor&)bootstrap_processor_storage;
}
extern "C" [[noreturn]] void init()
{
dbgln("Welcome to Serenity OS!");
dbgln("Imagine this being your ideal operating system.");
dbgln("Observed deviations from that ideal are shortcomings of your imagination.");
dbgln();
new (&bootstrap_processor()) Kernel::Processor();
bootstrap_processor().initialize(0);
// We call the constructors of kmalloc.cpp separately, because other constructors in the Kernel
// might rely on being able to call new/kmalloc in the constructor. We do have to run the
// kmalloc constructors, because kmalloc_init relies on that.
for (ctor_func_t* ctor = start_heap_ctors; ctor < end_heap_ctors; ctor++)
(*ctor)();
kmalloc_init();
for (ctor_func_t* ctor = start_ctors; ctor < end_ctors; ctor++)
(*ctor)();
Kernel::load_kernel_symbol_table();
auto firmware_version = query_firmware_version();
dbgln("Firmware version: {}", firmware_version);
dbgln("Initialize MMU");
Prekernel::init_prekernel_page_tables();
auto& framebuffer = Prekernel::Framebuffer::the();
if (framebuffer.initialized()) {
draw_logo();
}
dbgln("Enter loop");
auto& timer = Prekernel::Timer::the();
u64 start_musec = 0;
for (;;) {
u64 now_musec;
while ((now_musec = timer.microseconds_since_boot()) - start_musec < 1'000'000)
;
start_musec = now_musec;
dbgln("Timer: {}", now_musec);
}
}
// FIXME: Share this with the Intel Prekernel.
extern size_t __stack_chk_guard;
size_t __stack_chk_guard;
extern "C" [[noreturn]] void __stack_chk_fail();
void __stack_chk_fail()
{
Prekernel::halt();
}
using namespace Kernel;
[[noreturn]] void __assertion_failed(char const* msg, char const* file, unsigned line, char const* func)
{
critical_dmesgln("ASSERTION FAILED: {}", msg);
critical_dmesgln("{}:{} in {}", file, line, func);
// Used for printing a nice backtrace!
PANIC("Aborted");
}
extern "C" void exception_common(TrapFrame const* const trap_frame)
{
constexpr bool print_stack_frame = true;
if constexpr (print_stack_frame) {
dbgln("Exception Generated by processor!");
for (auto reg = 0; reg < 31; reg++) {
dbgln("x{}: {:x}", reg, trap_frame->x[reg]);
}
// Special registers
dbgln("spsr_el1: {:x}", trap_frame->spsr_el1);
dbgln("elr_el1: {:x}", trap_frame->elr_el1);
dbgln("tpidr_el1: {:x}", trap_frame->tpidr_el1);
dbgln("sp_el0: {:x}", trap_frame->sp_el0);
}
}
class QueryFirmwareVersionMboxMessage : Prekernel::Mailbox::Message {
public:
u32 version;
QueryFirmwareVersionMboxMessage()
: Prekernel::Mailbox::Message(0x0000'0001, 4)
{
version = 0;
}
};
static u32 query_firmware_version()
{
struct __attribute__((aligned(16))) {
Prekernel::Mailbox::MessageHeader header;
QueryFirmwareVersionMboxMessage query_firmware_version;
Prekernel::Mailbox::MessageTail tail;
} message_queue;
if (!Prekernel::Mailbox::the().send_queue(&message_queue, sizeof(message_queue))) {
return 0xffff'ffff;
}
return message_queue.query_firmware_version.version;
}
extern "C" const u32 serenity_boot_logo_start;
extern "C" const u32 serenity_boot_logo_size;
static void draw_logo()
{
Prekernel::BootPPMParser logo_parser(reinterpret_cast<u8 const*>(&serenity_boot_logo_start), serenity_boot_logo_size);
if (!logo_parser.parse()) {
dbgln("Failed to parse boot logo.");
return;
}
dbgln("Boot logo size: {} ({} x {})", serenity_boot_logo_size, logo_parser.image.width, logo_parser.image.height);
auto& framebuffer = Prekernel::Framebuffer::the();
auto fb_ptr = framebuffer.gpu_buffer();
auto image_left = (framebuffer.width() - logo_parser.image.width) / 2;
auto image_right = image_left + logo_parser.image.width;
auto image_top = (framebuffer.height() - logo_parser.image.height) / 2;
auto image_bottom = image_top + logo_parser.image.height;
auto logo_pixels = logo_parser.image.pixel_data;
for (u32 y = 0; y < framebuffer.height(); y++) {
for (u32 x = 0; x < framebuffer.width(); x++) {
if (x >= image_left && x < image_right && y >= image_top && y < image_bottom) {
switch (framebuffer.pixel_order()) {
case Prekernel::Framebuffer::PixelOrder::RGB:
fb_ptr[0] = logo_pixels[0];
fb_ptr[1] = logo_pixels[1];
fb_ptr[2] = logo_pixels[2];
break;
case Prekernel::Framebuffer::PixelOrder::BGR:
fb_ptr[0] = logo_pixels[2];
fb_ptr[1] = logo_pixels[1];
fb_ptr[2] = logo_pixels[0];
break;
default:
dbgln("Unsupported pixel format");
VERIFY_NOT_REACHED();
}
logo_pixels += 3;
} else {
fb_ptr[0] = 0xBD;
fb_ptr[1] = 0xBD;
fb_ptr[2] = 0xBD;
}
fb_ptr[3] = 0xFF;
fb_ptr += 4;
}
fb_ptr += framebuffer.pitch() - framebuffer.width() * 4;
}
}
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