diff options
| -rw-r--r-- | sys/arch/amd64/os/os_process.c | 102 | ||||
| -rw-r--r-- | sys/inc/mu/process.h | 44 | ||||
| -rw-r--r-- | sys/inc/os/process.h | 15 | ||||
| -rw-r--r-- | sys/os/os_process.c | 49 |
4 files changed, 210 insertions, 0 deletions
diff --git a/sys/arch/amd64/os/os_process.c b/sys/arch/amd64/os/os_process.c new file mode 100644 index 0000000..2a1d09a --- /dev/null +++ b/sys/arch/amd64/os/os_process.c @@ -0,0 +1,102 @@ +/* + * Copyright (c) 2025 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/errno.h> +#include <mu/process.h> +#include <mu/mmu.h> +#include <vm/phys.h> +#include <lib/string.h> + +#define STACK_TOP 0xBFFFFFFF +#define GDT_KERNCODE 0x08 +#define GDT_KERNDATA 0x10 +#define GDT_USERCODE 0x18 +#define GDT_USERDATA 0x20 + +int +mu_process_init(struct process *process, uintptr_t ip, int flags) +{ + struct trapframe *tf; + struct pcb *pcb; + uintptr_t stack_base; + uint8_t cs, ds; + int error; + + if (process == NULL) { + return -EINVAL; + } + + pcb = &process->pcb; + tf = &pcb->tf; + + error = mu_pmap_forkvas(&pcb->vas); + if (error < 0) { + return error; + } + + /* Allocate a new stack */ + stack_base = vm_phys_alloc(1); + if (stack_base == 0) { + vm_phys_free(pcb->vas.cr3, 1); + return -ENOMEM; + } + + /* Get the segment selectors based on mode */ + if (ISSET(flags, PROC_KERN)) { + cs = GDT_KERNCODE; + ds = GDT_KERNDATA; + } else { + cs = GDT_USERCODE | 3; + ds = GDT_USERDATA | 3; + } + + memset(tf, 0, sizeof(*tf)); + tf->rip = ip; + tf->rflags = 0x202; + tf->cs = cs; + tf->ss = ds; + + /* Map out the stack */ + error = mu_pmap_map( + &pcb->vas, + stack_base, + STACK_TOP, + PROT_READ | PROT_WRITE, + PAGESIZE_4K + ); + + if (error < 0) { + vm_phys_free(stack_base, 1); + vm_phys_free(pcb->vas.cr3, 1); + return error; + } + + tf->rsp = ALIGN_DOWN(STACK_TOP + (PAGESIZE - 1), 16); + return 0; +} diff --git a/sys/inc/mu/process.h b/sys/inc/mu/process.h new file mode 100644 index 0000000..2e69140 --- /dev/null +++ b/sys/inc/mu/process.h @@ -0,0 +1,44 @@ +/* + * Copyright (c) 2025 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. + */ + +#ifndef _MU_PROCESS_H_ +#define _MU_PROCESS_H_ + +#include <sys/types.h> +#include <os/process.h> + +/* + * Initialize machine specific process fields + * + * @process: Process to initialize + * @ip: Instruction pointer + */ +int mu_process_init(struct process *process, uintptr_t ip, int flags); + +#endif /* !_MU_PROCESS_H_ */ diff --git a/sys/inc/os/process.h b/sys/inc/os/process.h index 753779a..a2e3fdd 100644 --- a/sys/inc/os/process.h +++ b/sys/inc/os/process.h @@ -31,9 +31,13 @@ #define _OS_PROCESS_H_ 1 #include <sys/types.h> +#include <sys/param.h> #include <sys/queue.h> #include <md/pcb.h> /* shared */ +/* Flags for proc_init() */ +#define PROC_KERN BIT(0) /* Kernel thread */ + /* * Represents a running process on the * system @@ -48,4 +52,15 @@ struct process { TAILQ_ENTRY(process) link; }; +/* + * Initialize a process to a known state + * + * @process: Process to initialize + * @ip: Instruction pointer to jump to + * @flags: Optional flags + * + * Returns zero on success + */ +int process_init(struct process *process, uintptr_t ip, int flags); + #endif /* !_OS_PROCESS_H_ */ diff --git a/sys/os/os_process.c b/sys/os/os_process.c new file mode 100644 index 0000000..6bfa220 --- /dev/null +++ b/sys/os/os_process.c @@ -0,0 +1,49 @@ +/* + * Copyright (c) 2025 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/types.h> +#include <sys/atomic.h> +#include <sys/errno.h> +#include <os/process.h> +#include <mu/process.h> + +static size_t next_pid = 0; + +int +process_init(struct process *process, uintptr_t ip, int flags) +{ + if (process == NULL) { + return -EINVAL; + } + + process->pid = next_pid; + atomic_inc_64(&next_pid); + mu_process_init(process, ip, flags); + return 0; +} |