65617710fa
A Linux module is built with -mcmodel=kernel and can only reach addresses in the top 2 GB, where this kernel is not linked. So the kernel image is mapped a second time at LDLS_KALIAS, with a vmemmap area and a module area beside it, in one PDPT shared by every address space. Nothing loads a module yet; this is the address-space groundwork, set up at every boot, and include/ldls/ is the interface the loader will use. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
26 lines
931 B
C
26 lines
931 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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// The kernel's side of LDLS, as the rest of the kernel sees it. The layer
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// itself is kernel/ldls/; this is the handful of places it is called from.
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struct trapframe;
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// kernel/arch/x86_64/vm.c -- the window in the top 2 GB.
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void ldls_vm_init(void);
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int kmap_page(uint64 va, addr_t pa);
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addr_t kmap_phys(uint64 va);
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addr_t kunmap_page(uint64 va);
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// kernel/ldls/core.c
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void ldls_init(void);
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int ldls_ioctl(uint64 request, uint64 argp);
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// A trap in kernel mode. Returns 1 if LDLS dealt with it -- a WARN() that was
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// reported and stepped over, or a hosted driver that faulted and has been
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// stopped -- and 0 if it is the kernel's own and should panic as before.
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int ldls_trap(struct trapframe *tf);
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// The name of an address in a hosted module, for a backtrace. 0 if `a` is not
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// in one.
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int ldls_symbolize(uint64 a, char *out, int cap);
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