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-rw-r--r--sys/arch/amd64/amd64/proc_machdep.c107
1 files changed, 107 insertions, 0 deletions
diff --git a/sys/arch/amd64/amd64/proc_machdep.c b/sys/arch/amd64/amd64/proc_machdep.c
new file mode 100644
index 0000000..eb3866a
--- /dev/null
+++ b/sys/arch/amd64/amd64/proc_machdep.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/proc.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/errno.h>
+#include <machine/frame.h>
+#include <machine/gdt.h>
+#include <vm/physmem.h>
+#include <vm/vm.h>
+#include <vm/map.h>
+#include <string.h>
+
+/*
+ * MD thread init code
+ *
+ * @p: New process.
+ * @parent: Parent of new process.
+ * @ip: Instruction pointer.
+ */
+int
+md_td_init(struct proc *p, struct proc *parent, uintptr_t ip)
+{
+ uintptr_t stack_base;
+ struct trapframe *tfp, *parent_tfp;
+ struct pcb *pcbp;
+ uint8_t rpl;
+ int error;
+
+ tfp = &p->tf;
+
+ /* Create a new VAS for this thread */
+ pcbp = &p->pcb;
+ if ((error = pmap_new_vas(&pcbp->addrsp)) != 0)
+ return error;
+
+ /*
+ * If parent is NULL, assume kernel space and zero the
+ * trapframe. Otherwise we can just set it up normally.
+ */
+ if (parent == NULL) {
+ rpl = 0;
+ memset(tfp, 0, sizeof(*tfp));
+ } else {
+ parent_tfp = &parent->tf;
+ rpl = parent_tfp->cs & 3;
+ memcpy(tfp, &parent->tf, sizeof(*tfp));
+ }
+
+ /*
+ * RPL being 3 indicates that the parent thread is in
+ * userland. If this is the case, we'd want this new thread
+ * to also be in userland.
+ */
+ tfp->rip = ip;
+ tfp->cs = (rpl == 3) ? (USER_CS | 3) : KERNEL_CS;
+ tfp->ss = (rpl == 3) ? (USER_DS | 3) : KERNEL_DS;
+ tfp->rflags = 0x202;
+
+ /* Try to allocate a new stack */
+ stack_base = vm_alloc_frame(PROC_STACK_PAGES);
+ if (stack_base == 0)
+ return -ENOMEM;
+
+ /*
+ * If RPL is 0 (kernel), adjust the stack base to the
+ * higher half. If we have an RPL of 3 (user) then we'll
+ * need to identity map the stack.
+ */
+ if (rpl == 0) {
+ stack_base += VM_HIGHER_HALF;
+ } else {
+ vm_map(pcbp->addrsp, stack_base, stack_base,
+ PROT_READ | PROT_WRITE | PROT_USER, PROC_STACK_PAGES);
+ }
+
+ p->stack_base = stack_base;
+ tfp->rsp = ALIGN_DOWN((stack_base + PROC_STACK_SIZE) - 1, 16);
+ return 0;
+}