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https://github.com/taigrr/gopher-os
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5fc6ce188e
All calls (but one) to kernel.Panic have been replaced by calls to panic. A call to kernel.Panic is still required to prevent the compiler from treating kernel.Panic as dead code and eliminating it.
43 lines
1.3 KiB
Go
43 lines
1.3 KiB
Go
package kmain
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import (
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"github.com/achilleasa/gopher-os/kernel"
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"github.com/achilleasa/gopher-os/kernel/hal"
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"github.com/achilleasa/gopher-os/kernel/hal/multiboot"
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"github.com/achilleasa/gopher-os/kernel/mem/pmm/allocator"
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"github.com/achilleasa/gopher-os/kernel/mem/vmm"
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)
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var (
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errKmainReturned = &kernel.Error{Module: "kmain", Message: "Kmain returned"}
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)
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// Kmain is the only Go symbol that is visible (exported) from the rt0 initialization
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// code. This function is invoked by the rt0 assembly code after setting up the GDT
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// and setting up a a minimal g0 struct that allows Go code using the 4K stack
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// allocated by the assembly code.
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//
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// The rt0 code passes the address of the multiboot info payload provided by the
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// bootloader as well as the physical addresses for the kernel start/end.
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//
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// Kmain is not expected to return. If it does, the rt0 code will halt the CPU.
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//
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//go:noinline
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func Kmain(multibootInfoPtr, kernelStart, kernelEnd uintptr) {
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multiboot.SetInfoPtr(multibootInfoPtr)
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hal.InitTerminal()
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hal.ActiveTerminal.Clear()
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var err *kernel.Error
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if err = allocator.Init(kernelStart, kernelEnd); err != nil {
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panic(err)
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} else if err = vmm.Init(); err != nil {
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panic(err)
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}
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// Use kernel.Panic instead of panic to prevent the compiler from
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// treating kernel.Panic as dead-code and eliminating it.
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kernel.Panic(errKmainReturned)
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}
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